Here is the list:

1. Announcement, News or rules attached to left bar, anywhere else.
2. Moderator roles.
3. Tagging on comments/replying on comments.
4. Enabling/Disabling "show only friends on OSSNWall".
5. Special tags like "Website owner's friend".
6. Users creating their own pages for their own products etc.
7. Chats that doesn't load forever after sending a text.
8. Reactions for posts just like Facebook.
9. GIFs as profile pictures and as advertisement photos.
10. A bot that blocks curse words and posts YouTube video from a user (can be multiple users) when the user uploads a new video.
11. Creating private group chats.
12. Being able to send images, gifs, videos etc. on chat.
13. Previews of the YouTube videos on chat or on posts.
14. Being able to edit or delete comments.
15. Voice or video calling people.
16. Pinning posts on OSSNWall and in private messages.

I think some features like this shouldn't be with money. There may be some people that can not afford it.