account with either a phone number (U.S.-only for now) or your Skype username. Next you choose whether to let any of your followers call you or only a specific Twitter user. And finally, you specify the window of opportunity or how long you want the tweet-to-call option to be open. The service then sends out a tweet along the lines of "@sohear please call me within 30 minutes via http://zin.to/". Pretty neat, huh.

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Authors: Steve O'Hear

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