Is Twitter the next Second Life? A mere 40 percent of new visitors return to site

A new study by Nielson Online found that 60 percent of people who sign-up for Twitter do not return after one month. That means only 40 percent of new visitors return, which is up from 30 percent, Nielson reported. MediaWeek suggested these numbers make Twitter similar to the over-hyped virtual world Second Life, which enjoyed much press attention a couple years ago.