Digital currencies that reward users for post/comments:

Steem pays users based on content, up votes, and long term commitment. https://steemit.com/

Doge users still receive tips for posts and comments on Reddit. https://www.reddit.com/r/dogecoin

ArtByte rewards users as they achieve forum ranks, based on posts & comments. http://forum.artbyte.me

Any other coins do this?