This totally skipped my mind in the mess of Wikimania: Outernet are having their first editathon in Uganda tomorrow(!).
Twitter: • Help @Outernet, and build Wikipedia, at their first ever edit-a-thon this weekend. http://editathon.outernet.is/
Facebook/G+: • Outernet wants to broadcast the world's knowledge to anyone on Earth for free. Help them find the best digital content, and help expend Wikipedia's coverage, this weekend. http://editathon.outernet.is/
Joe