We can attribute many different uses to memes, but the main thing that all of them want to do is grab our attention. This is one of the most cutthroat parts of the attention economy here, where the mere decision of choosing to take those few extra seconds to share an image with someone else is seen as the utmost victory.
It's simple and it's brutal, and most of us don't even think about it when all we're trying to do is find some easy entertainment. One by one, these snippets are grinding down our attention span, while demanding as much of it as possible at the same time. Fun!
This means that we can get more rewarded for being slightly more discerning with what we choose to look at. A list such as this can be here to help. It's up to you to decide if they're worthy, but at least they're in a kind of neat package.