Social network originated from social network, and the starting point of social network is email. Internet is essentially the networking between computers. Early e-mail solved the problem of long-distance mail transmission, and it was also the most popular application on the Internet and the starting point of social networking. BBS goes further, normalizing "mass sending" and "forwarding", and theoretically realizing the function of releasing information and discussing topics to everyone (the boundary is the number of BBS visitors). BBS pushes social network forward, from simple point-to-point communication cost reduction to point-to-point communication cost reduction. Instant messaging (IM) and blogs are more like upgraded versions of the first two social tools. The former improves immediate effect (transmission speed) and simultaneous communication ability (parallel processing). The latter began to embody the theory of sociology and psychology-information publishing nodes began to embody stronger individual consciousness, because scattered information in the time dimension can be aggregated and then become the "image" and "character" of information publishing nodes. For example, RSS, flickr, YouTube, Digg, Mini-feed, Twitter, Fexion and Video-Mail all solve or improve a single function, which is a tool to enrich social networks. With the quiet evolution of social networks, a person's image on the network tends to be complete, so social networks appear. Making friends is just the beginning of social network, just as the beginning of Google is as common as the reverse link of every web page. The beginning of social network is only to get your personal data and friends list. Generally speaking, social networks have experienced such a development process: the early conceptualization stage-the six-degree separation theory represented by-six degrees; The stage of making friends with strangers-according to this theory-Friendster helps you to establish weak relationships, thus bringing higher social capital; Entertainment stage-MySpace's theory of creating rich multimedia personalized space to attract attention; Social graph stage-Facebook copied the theory of offline real interpersonal network to online low-cost management. The whole process of SNS development is that people gradually transfer the more complete information flow of offline life to online for low-cost management, which makes virtual social interaction more and more Baidu.

Cross with social interaction in the real world. In human history, most important technological revolutions are accompanied by media revolutions. Any human activity is essentially an information activity. Different transmission media and information flow management methods will determine the way you receive information. All the changes in information streaming media must be the changes at the bottom-the same is true of social networks. From the evolutionary history of social networks, it has always followed the principle of "low-cost substitution". Network socialization has been reducing people's social time and material costs, or reducing the cost of managing and transmitting information. At the same time, network socialization has been trying to replace traditional socialization by constantly enriching means and tools to meet the communication needs of social animals like human beings, and approaching the basic needs according to the trajectory from "incremental entertainment" to "constant life". If in the e-mail era, the starting point of social networks, the network can only meet people's social needs of 5%, then today's rich social networks can at least increase this number by 10 times. In addition to "contact" social behavior, or the collection and release of "contact" information, social networks have begun to assume the role of most traditional social networks. In fact, "non-contact" social interaction has already occupied more than 80% of human social interaction, which means that online social interaction will inevitably have a huge impact on the traditional world. In the final analysis, social network is not only some trendy business models, but also a key force to push the Internet infinitely close to the real world from a historical perspective. At present, social network covers all forms of network services with human socialization as the core. Internet is an interactive platform that can communicate with each other, communicate with each other and participate in each other. The development of Internet has already surpassed the original military and technical purposes of ARPANET. Social networks expand the Internet from research departments, schools, government and commercial application platforms to human social tools. Nowadays, social networks have extended their scope to the field of mobile phone platforms. With the popularity of mobile phones and the application of wireless networks, mobile phones have become the carrier of new social networks by using various software such as dating/instant messaging/email sending and receiving. Social network, that is, network+social. Connect people through the network, thus forming a group with certain characteristics.

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UCenterHome

UCenterHome is a set of social networking software (SNS) built by PHP+MYSQL. Through UCenterHome, website builders can easily build a communication network with friends as the core, so that website users can record the dribs and drabs of life with a mini blog; It is convenient and quick to publish logs and upload pictures; It is more convenient to share information with friends and discuss topics of interest. Learn the latest news of friends easily and quickly. UCenterHome emphasizes the concept of "home" and fully recognizes the importance of personal privacy of each website user. Provide powerful and rich privacy settings. Everyone has the right to set up their own personal homepage, materials, logs, photo albums, etc. Is public, or can only be viewed by friends, or designated special friends, or only by themselves, or only by entering a password; And you can completely control which actions can be dynamically pushed to your friends. UCenterHome emphasizes only providing information that users are willing to pay attention to, and has multi-level filtering control on information noise. Everyone can group their friends and choose which user groups to block; At the same time, it can be shielded separately for specific friends and specific trends to ensure the information noise brought by the increase of friends.

Iweb social network

As a large-scale open source SNS software with high concurrency and high load, iwebSNS is powerful, easy to expand, and has good expansibility and stability. It is developed based on the framework of iweb SuperInteraction (iweb SI for short). With the help of iwebSI platform, the site can easily obtain cluster computing and processing capabilities (distributed computing and storage/high availability/load balancing) that support hot plug and quickly add new nodes, thus facilitating the management of the growing data volume of web2.0 sites. The web layer and db layer of SI are load-balanced, and the distributed cache system based on memory, dfs (Distributed File System) and distributed data storage can easily support the site to have the ability to serve millions or even tens of millions of users, no matter whether the requests for these interactive services come from computers or mobile terminals. In addition, Jooyea technical team also provides a lightweight support library, which makes iwebSNS easy to deploy on virtual hosts. IwebSNS provides a friendly and easy-to-use ajax interface for personal information and message management of site users. Through it, the website builder can easily build a communication network with friends as the core, and let the website users record, show and share their lives through functional modules such as space, log, dynamics, friends circle, group, photo album, letter in the website, message board and mood. Learn about friends' dynamics. If you already have a large user base and want to expand to SNS, or you want to deploy an SNS site that can meet the sustained and rapid growth of users and achieve smooth scale, then iwebSNS is just right for you.

Elgg

Elgg is an open source social networking platform. Own: personal user information management. Blog function. Document management. Through various means (such as e-mail, internal messages, etc. ), allowing you to use plug-ins to extend notification methods (such as SMS) to know what your friends are doing at present. Create circles, support circle discussions, and enjoy documents. Elgg was originally designed for education, but its function makes it a very good social platform.

ThinkSNS

ThinkSNS provides all-round social networking (SNS) solutions based on many excellent open source software development. ThinkSNS is all based on open source projects, and it is also provided to users free of charge as an open source project. The project framework has perfect documents and examples, which is very suitable for secondary development. International support: multi-template and multi-language support. Based on the excellent design of ThinkPHP framework, ThinkSNS is born with excellent internationalization ability and supports multiple languages and templates. ThinkSNS is not just a web-side program. With the growth of ThinkSNS, we will also develop related IM and client support. ThinkPHP has built-in support for WordPress plug-in development, and we will provide a perfect API to integrate seamlessly with other systems.

OpenPNE

OpenPNE is an open source sns engine developed by Kazuyuki Co., Ltd., which is equipped with rich sns functions and can be used for free on both PC and mobile phone. As a communication tool within the company and various communities, "『OpenPNE』" has a wide range of applications, involving mobile phone service, video service, internal human resource management, recruitment, dating/matchmaking, commodity search and shopping, SNS business contact expansion, health/beauty, education and other service fields.

Edit this paragraph security.

According to the latest survey of Webroot, a security software company, users of social networking sites are more likely to encounter security threats such as financial information loss, identity information theft and malware infection, which may be more serious than users' own imagination. The survey found that two-thirds of the respondents didn't take strict measures to protect their personal information on social networking sites. Others can view these sensitive information through search engines such as Google \ Baidu, and more than half of the respondents don't know who can view their personal information. About one-third of the respondents said that their social networking site profiles contain at least three kinds of personally identifiable information, and more than one-third of them use the same password on multiple websites. In addition, one third of people accept strangers' Friend Request. Mike Kronenberg, chief technology officer of Webroot's consumer business, said, "The growth of social networking sites has become a huge target for hackers. Last year, the time people spent on social networking sites such as Facebook tripled the growth rate of the entire Internet. " Kellenberger said, "Three out of ten people we surveyed have experienced security attacks on social networking sites, including personal identity theft, malware infection, spam, unauthorized password modification and phishing fraud. The first step in achieving security protection is to identify the types of security threats and then understand how to protect them. " Computer criminals use different types of deception and malware to take advantage of dangerous behaviors. A common strategy is phishing, in which hackers trick users into downloading infected files, visiting risky websites other than social networking sites, or sending money to "friends in trouble". Webroot said that in recent months, such attacks against social networking sites have been on the rise. After a hacker hijacks a social networking site user's account, he sends a message to his contact to trick the other party into making improper behavior.