(CNN) — If you’ve spent any time on Facebook in the past day or so, you may be wondering: What’s up with all the giraffes?
Are they suddenly endangered? Is the circus in town? Is Toys R Ushaving a sale?
No, no and no. (Although depending on where you live, the circus may actually be in town.) Photos of the spindly, long-necked animals are the byproduct of a meme that’s been sweeping the social network in recent days.
The meme invites users to share a riddle with their friends, who then are supposed to send a private message with the answer (don’t post it in the comments, obviously). Any user who guesses wrong must agree to change his or her profile photo with one of a giraffe.