1. Music platforms: such as Netease Cloud Music, QQ Music, Cool Dog Music, etc. These platforms provide play online and download functions of the song "Jiangnan", and also provide functions such as lyrics display, song recommendation and comment interaction.
2. Social media: such as Weibo, WeChat, Tik Tok, etc. Many users on these platforms also share the song Jiangnan, as well as videos, pictures and texts related to the song.
Therefore, both music platforms and social media are important channels for people to obtain and share the song Jiangnan, and they belong to the category of mass media.