I heard about Dragoncave in another fandom I frequent, and I got quickly addicted to it, myself.
The point of the site is to steal eggs, which you need to post and showcase in various places, requesting clicks. The eggs need clicks in order to hatch and the hatchlings need clicks to grow up. If they don't get enough, they will die (they can die in both the egg stage and the hatchling). Once they're all grown up, clicks are no longer needed and special abilities are unlocked, such as breeding them to have more eggs.
I guess it's kinda like Pokemon, in a way, because the point is to raise them into adults and collect as many as you can. There are even rare eggs, which require more clicks than the common ones.
Anybody wanna join? I didn't really care about it at first, but I warn you, this thing gets addicting real fast!