Which server to find more socializing?...
Tarnished Coast has a really nice community (I might be a little biased, however, since Ive been on TC since beta). You can guest first to check it out before you decide to transfer.
As far as guilds go, look through the guild section of this forum. Check out those that have posted details about what they are/do/require/etc, or even make a post in the Looking for Guild section detailing what you seek in a guild (pve/pvp/pvx, RP. Small/Medium/Large, etc) and offers will come in. Look through what there are and see what seems like a good fit.
Feel free to send me a whisper if you need help with anything
Join Us – http://www.thegryphonsaerie.com
I have also been on Tarnished Coast since the beta’s but I’m still going to have to recommend it, its a brilliant community for the most part, plenty of nice guilds, and even on the lower level maps, I am always able to find other players who want to party up and chat whilst exploring and levelling up.
We also love our WvW most of the time and usually have plenty of people over there if that’s your thing.