Some people will use it to advertise or sell goods. This kind of behavior belongs to brushing the screen. If found, the administrator will block the account or delete the post. So when you post invitations, be careful not to draw too many people, so as not to be misunderstood as spam.
Before pulling people, you can carefully understand each other's hobbies and see if it is suitable to join your post bar. After the invitation is initiated, if the other party is interested, you can ask the other party's post bar to hold hands and establish some contacts with each other, which can promote each other and deepen friendship.