No matter what kind of niche things you look up online, it’s quite likely there are already people making memes about them. At the same time, not everyone craves niche memes—some just look for things ...

Last week, I enlisted Slate readers to help divine how Facebook’s “25 Random Things About Me” trend got started. More than 3,000 of you responded, answering queries on when you first saw a “25 Things” ...