I recently discovered Live Mocha. There are parts of it I do not like, such as the search function for friends, but they do have free language lessons and exercises given by native speakers.

It's rather a conversational and culture exchange site: solarnet.tv

The following is not a social site but you may find it helpful. The BBC standard of English is reasonably uniform and understandable by most people. Good luck with your studies Stephen http://www.bbc.co.uk/worldservice/languages/