Bubbly, a social network that allows users to leave short voice recordings in the same way Twitter posts text messages, is racking up a major following in India, thanks in part to early support from Bollywood celebrities. The service, which lets users "tweet" mobile audio messages to their followers, hasn't officially launched, but it gained an estimated 500,000 users in four weeks after Indian film stars talked up the product while doing publicity for a film.

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