If only home sales were growing like Twitter. Visits to the micro-blogging Web site, where users post “tweets” of 140 characters or less that are read by the other Twitter members following them, increased from 475,000 unique visitors in February 2008 to 7 million last month. And perhaps in a quest for new marketing tools, New York City brokerages are among those in a hurry to sign up. Read the full story from the April … [more]