Where Twitter is generating revenue is via ExecTweets, which collates the tweets from a number of executives. This is run by Federated Media and sponsored by Microsoft (NSDQ: MSFT). Federated Media is sharing some of this sponsorship revenue with Twitter, according to VentureBeat: “We can’t talk about terms of the deal, but we did want to share some of the revenue with Twitter to support them,” Federated Media’s John Battelle said. There is also a plan to make revenue with the service beyond Microsoft’s sponsorship. The site lets you vote for tweets to send them to the top, and has lists of Top Links, Hot Topics, Most Popular and Recently Recommended.

And there’s no surprise, that Twitter continues to grow after three years…“Visits to Twitter have increased 1,382 percent since last year - from 475,000 unique visitors in February 2008 to 7 million in February 2009, according to Nielsen” reports PC Mag. Nielsen also has some other stats about Twitter: “Adults between the ages of 35 and 49 comprise almost 42 percent of the site’s audience - and about 62 percent of them are accessing the site from work. The average user hits Twitter.com about 14 times a month and spends about seven minutes on the site…In January, about 735,000 unique visitors access the site through their phones and PDAs. In the last quarter of 2008, meanwhile, about 812K unique text messages were sent to Twitter from AT&T (NYSE: T) and Verizon (NYSE: VZ) cell phones.” Big companies are starting to note the uptake—PaidContent has a post on mainstream companies incorporating the service into their products.