RPG stands for Role Playing Game. MMORPGstands for Massively Multiplayer Online Role Playing Game. So, a RPG is just a role playing game, But, a MMORPGis a online role playing game.

You are NOT supposed to be role-playing in Facebook,as it is against their rules.

The word role can be a noun adjunct in "role playing" but the words would be hyphenated when used as an adjective, such as in "role-playing game."

The Doctor Who Role Playing Game happened in 1985.

Timelords - role-playing game - happened in 1987.