@Screwtapello birb content is cool! My tangent though is the user-generated Lemmings puzzles in the mobile Lemmings game. It's a recently introduced feature, and whilst most are also crap, they have a ranking system (automatic afaik, based on how many players solve any given puzzle), and the five star puzzles truly live up to the Lemmings Mayhem tradition.
@nemothorx Lemmings as a mobile game seems a bit scary; my memories of the original involve a lot of clicking in very precise locations at very precise times, and that seems like it would get frustrating on a touch screen. How does it hold up in practice?