According to research figures from Nielsen Online over 60% of users of microblogging service Twitter stop using the site after a month.
The US figures show that despite Twitter growing exponentially in the last year - an increase of over 100% year-on-year in the US in March - the rate of retention is just 40%.
The site, made popular by celebrities such as Stephen Fry, Russell Brand and Ashton Kutcher has also attracted brands, hoping to cash in on the rapidly growing audience on the site.
Twitter is yet to produce a business model and although rumours of Apple snapping it up gather momentum, the markets are asking the obvious question of what monetary value can it bring to any owner?
The Nielsen figures also show that rival sites such as Facebook and MySpace, had retention rates nearly twice as high as Twitter, at some 70%.
David Martin, vice president of primary research at Nielsen Online, said,