Nielsen Study: Twitterers Quit After 1st Month

Not long ago, Reuters reported a Nielsen Online study about twitter users. Here is an excerpt…

Twitter’s audience retention rate, or the percentage of a given month’s users who come back the following month, is currently about 40 percent,” David Martin, Nielsen Online’s vice president of primary research, said in a statement….Martin said Facebook and MySpace, the more established social network sites, enjoyed retention rates that were twice as high and those rates only rose when they went through their explosive growth phases.

Hmmm. I am curious to see if this trends holds true in the days ahead? Any ideas how long twitter, myspace, and facebook will sustain the marketshare of social networking?