Would be great to add support for the open source micro blogging service - identi.ca (and ideally any generic Laconica instance) to BackType.
Don't know if it helps but identi.ca supports a Twitter compatible API.
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Identi.ca and other Status.net micro-blogging sites are just as much a part of the social news eco system as Twitter and Facebook and should not be ignored.
Ideally Backtype should also be aggregating from other social networks too such as MySpace, LinkedIn, FriendFeed and when the new distributed social networks are ready such as The Appleseed Project, GNU Social and Diaspora*