More than 60 percent of US Twitter users fail to return the following month, reports the Business Insider.

Twitter’s 40% retention rate is higher than it was a month ago. But social networking giants MySpace and Facebook manage a much higher retention percentage (60%) of new users each month.

A February analysis found that the majority of Twitter users worldwide are 35 or older. Young adults (18-24) make up only 10.6% of the Twitter population in the US and are less likely than the average Twitter user to “tweet,” or participate via a microblog post.