I feel that Final is on a totally different social level than other MMO I've ever played. A majority of games have the social function centered around guilds and chats, but Final does an amazing job of players' characters interfacing with one another.
I'm thinking this is supported by the wonderful emotes that are used and other things such as bard performance. Mounts with two seats, homes as well as apartments, in-game wedding activities and other such things let you do nothing with friends really enjoyable.
Compare GW2 with other MMOs. Amazingly, the game is extremely cooperative due to its game's fundamental design. However it isn't particularly... but not in the real sense.