To be part of the in-crowd in Silicon Valley, you have to know about and use the latest hot new apps.
Years ago, that was Gmail; this week it's Hey, a new email service.
Below is a list of six of the hottest apps in the Valley.
Unfortunately, most of them are invitation-only, so there's good chance you won't be able to join the hip crowd.
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Silicon Valley can be a cliquey place.
Every so often, a new app or service launches that only the...
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