Work fast. Do good. Invite everybody. Mash up these appealingly simple strategies with a Web 2.0 tool like Twitter, the popular microblogging platform, and you wind up with something called a Twestival.

During the world’s first Twestival, on Feb. 12, near-simultaneous fundraisers took place in pubs and clubs in 202 cities around the globe. The buzz began building a couple of weeks earlier, thanks to chatter in the Twitterverse. (For anyone who’s managed to miss the latest Internet phenomenon,...

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