Recently Facebook followed Twitter, Instagram, Pinterest, Google+ and Tumblr in adding hashtags to status updates. The early indicators have them labeled as a flop that can actually discourage viral behavior. But there are too few stats yet to bear this out. The same study by EdgeRank from July shows that the adoption rate has been low, just over 20% of Facebook posts. The study didn’t check who was using hashtags on Facebook, but it‘s probably more those using the social medium for marketing and less friends using them in daily conversation or fundraising through them. By contrast, 58% of those on Twitter use hashtags and 41% click on hashtags to learn more about brands. The latest stats from social scientist Dan Zarrella shows that tweets with hashtags are 55% more likely to be retweeted.