Facebook is testing a service that will charge users $1 to guarantee that messages they send to people they are not friends with arrive in users' inboxes.
Launched in 2011, the oft-ignored "other" folder is where FB routes messages it deems less relevant. The $1 fee would re-route them to the inbox.
Not quite spam, these include messages from people you most likely don't know, based on FB's reading of your connections. Many users ignore this folder.
Now, users will be able to pay $1 to sent messages to non-friends.