That all depends on what you're playing, what games we have and play, and what server & world we play in and not to mention what MMORPG you're looking for as well.
For me, well I play maple story since I'm stuck with the game till I get a job so I'm in a guild that my friend dragged me into, but we're inactive right now and i'm the only active member in the guild. You can find me in broa world. oh about the guild, my guild leader said it's made for social. I wouldn't recommend playing this game due to negative and bad reviews. You can tell by a lot of complaints, and issues are being ignored and not resolving at a longest time and people can't abide nexon's time and work just to resolve the issue. The game is just full of bugs & glitches and sometimes the exploits as well. You can read a lot of negative reviews of this game (including mine) on the steam client or other sites that has written negative and bad reviews. The game is free-2-play, but most people say it's pay-2-win instead of free-2-play
I also play Final fantasy XI, but I'm not sure what became of my social and dynamis linkshells right now. According to my linkshell leader, they have 2 social linkshells for now, but you'll find most of us in asura server. I'm not playing this game currently till I get a job so yeah, this game is pay 2 play
By popular final fantasy MMORPG would by XIV. I've seen a lot of people play the game, but I don't play this game anyway although I'm pretty sure there are few people who played this game before. final fantasy XIV is also pay 2 play. I've seen my brother play the game, but I'm not even sure if the game catches my interest.