Users can bookmark a RSS feed, they can read their feed and discover RSS feed bookmarled by others and directly bookmark the memes they want to keep and share.

maybe with implementation of this GPL codes : http://lylina.sourceforge.net/ or http://rss.gregarius.net/ Example :

I bookmark a RSS Feed (same way than new meme, with type RSS but didn't display in new memes list). I can read my different Feed. By default, visitors can read all feeds. A user can manage the feeds he wants to read (the one he bookmarked and some others from different users) User can directly bookmark his favorites like memes