Since I joined TechCrunch I've seen more Twitter clones and derivatives then I'd care to remember, most of which haven't really gone anywhere. But there are a few gems that have managed to tackle markets that Twitter has, for whatever reason, ignored. One of these is Yammer, the "Twitter for businesses" that won the top prize at last year's TechCrunch50. And in the last few days, it's become increasingly clear to me that there's another niche market just waiting for a Twitter-like service: Family.
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