Someone was supposed to post 500 in a single day the other week. Apparently he's still posting them, because ain't no way anybody can post 500 in a day. Just posting 500 in a day is liable to put somebody in a state of delirium which will cause them to cease memeing for the rest of their days if they try to recuperate. For the rest of their life.
Kylie Fan/Slobama used to post a lot everyday. Not sure if he's the record though.