**Edit updated once I got to Work**
I'll post a list once I log on at work today, To hard to do on my phone
** Edit Start **
My personal Favourits are:
Star Wars Combine
Elder Scrolls Online (Helps to have a adventuring party)
FFXIV Online
Guild Wars 2
Of those however only SWC (Star wars Combine - is web based and free but all are good)
Others worth have trying are:
WOW
AD2046 (Not a huge amount of interaction with others)
Runescape
Eldevin (Never played it but heard good things)
Adventure Quest
Imperial Conflict (Very good forums in some galaxy's, not so good in others - played it for 6 years tho till I rage quit one day for getting pwnd)
Obviously they all are only as good as the time you put in, the web based ones tend to have quite active forums where you can have a lot of fun talking to people but if you don't get onto the forums you wont get much from them.
Iv played SWC since 2002 (it my longest running game), made RL friends out of it and they were the first people I came out to ironically. I decided to jump on a private voice sever a few of us set up and got some rather confused people the first time I opened my very male sounding mouth.