Yeah, definitely, I agree with that. I delete images regularly (mostly to keep the number down to make it easier for me and others to search through).
But I meant more, keeping track of others' memes you like. Right now I could make a memestream of my favorite memes on imgflip, but if they got upvoted, I would get the points (which is kind of lame). It would be cool if I could just make a 'Favorites' memestream or two (maybe different topics etc) and just corral other people's memes into them, to make it easier to look back on memes I've liked, and that way if it gets upvotes they get the points.