What happens on Twitter doesn't stay on Twitter. That's the word from a new report by Exact Target (Thanks to eMarketer for the tip.) According to the research, Twitter users are: 5 times more likely to post to blogs at least monthly 3 times more likely to post product reviews and post in an online forum 5 times more likely to share coupons on coupon sites They also are more likely to write articles for third-party sites, post videos,