For clans (communities) xfire is really handy. When you join a clan in xfire (after you got accepted) you get all the members in a separate list (so you don't have to add all the people from your clan).
You can also manage your members (roster) as admin and put them in groups (give them rights). You have your own clan site with news, a calender (for events, trains), a forum, server favorites, info about your clan, your clan screens & vids, your clan logo, ...
You can add clan games so it counts the hours of all members playing the games. And you can find other clans /players playing the same game, too.
You can use the messenger during playing, so you could start a chat room just with your mates.
When you upload new screens, add a new friend, etc. your friends see that (like in facebook) on xfire.com.
http://www.xfire.com/games/blockland/Blockland/
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