Getting messages from "friends" telling you they have received new friend requests from you?
Most folks are sending the message out because the message tells them to forward it. The friend request hoax is leading lots of people to post "don't accept friend requests from me" in their news feeds.
Remember the account cloning epidemic that happened a long time ago? That's what makes this hoax more believable than usual.
The giveaway that it's a hoax? It tells you to forward it to others.
The current hoax is just one of many that have fooled Facebook users within the Facebook Messenger application. Simply delete the message — it's false and someone who created it enjoys seeing his work go viral.