I launched AwesomeGIFs as a place to find and share reaction GIFs, back when that was still a novel idea. It landed on the front page of Reddit a few times, specifically r/gifs. And it was some of the most fun I’ve had because I did it entirely for fun and it took off.
This also had an iOS app and spawned an ecosystem of sites, such as AwesomeLOLs and HappyGIFs.
I eventually stepped away from it, and wrote about why.