I don't recall whether these (fairly new) sites have been mentioned here already, but the search thingie doesn't find them, so here goes...
http://eo.chatonic.com - chatrooms
http://zamzono.net - social networking site, including chat
Darcy Ross on Local Groups
Haroldo de Esperanto on NASK
Esperanto: Learning and Using the International Language.
By David Richardson.
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