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In addition to helping you find people, or simply see whether or not you’re the most popular Pete, Adam, or Stan on the service, the search interface integrates Twitter’s invite tool that lets you email your friends about Twitter.
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Part of that tool is an address book import which will show you which of your contacts are already on Twitter so you can follow them. That feature’s also not new, but when included with Twitter’s now prominent people search, it could give yet another viral boost to the service.