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While there are no clear numbers yet for how many people are using such sites, there are probably at least 7.5 million people who use these Web-based social networks. That's big enough that Google has recently created its social networking site, Orkut, and America Online just launched its site, ICQ Universe.
Now sites such as Ryze, Spoke Software, Always On Network and LinkedIn are the latest to try to benefit from connecting people, this time to get a job, meet a business partner, find venture funding or simply to gather information. Of all of these, LinkedIn is the most strict about keeping its site solely for professional, business purposes. Corporate Inter-Face-Time