As Twitter celebrates its three-year anniversary, its new deals with giant companies like Salesforce and BusinessWeek seem to hint at a sparkling future. And thanks to a new sponsorship agreement that Federated Media brokered with Microsoft, the service will begin generating funding that doesn’t come from a handful of venture capitalists.

One advantage Twitter has over social networking sites like Facebook is that users don’t have to visit the site to use its service. Its extensibility makes it more convenient and easy to integrate into corporate training platform, customer service departments and marketing schemes.

Best Buy is another large company that has incorporated Twitter, adding feeds to its new social-media hub and learning system, ConsumersPrice.com. Users can comment on various products through Twitter, share product photos using Flickr, and receive price alerts via SMS.

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