Michelle McGiboney, Nielsen Online
Twitter.com continues to grow in popularity and importance in both the consumer and corporate worlds. No longer just a platform for friends to stay connected in real time, it has evolved into an important component of brand marketing. Unique visitors to Twitter increased 1,382 percent year-over-year, from 475,000 unique visitors in February 2008 to 7 million in February 2009, making it the fastest growing site in the Member Communities category for the month.  Zimbio and Facebook followed, growing 240 percent and 228 percent, respectively.
Fastest Growing Member Community …