More than 60 percent of users who sign up for Twitter stop using the service just a month after joining, according to research from Nielsen Online, AFP reported.

The audience retention rate for the micro-blogging site is at about 40 percent, said David Martin, vice president for primary research at Nielsen Online. Although the site's unique audience was up more than 100 percent in March, the real battle will be to keep users.

"Twitter has enjoyed a nice ride over the last few months, but it will not be able to sustain its meteoric rise without establishing a higher level of user loyalty," he said, according to the AFP article, posted by The Australian. "A retention rate of 40 percent will limit a site's growth to about a 10 percent reach figure."