First of all, the 400k is a number, not a metric. Techcrunch only mentions it to create a polite segue to their skepticism.
Bear in mind that the number of users is particularly useless, because about.me is an vanity URL-based service. People stampede to reserve a /<firstname> domain. This is also the case for Twitter, Tumblr, and the Facebook vanity URL, or whatever they call it.
Bear in mind that the number of users is particularly useless, because about.me is an vanity URL-based service. People stampede to reserve a /<firstname> domain. This is also the case for Twitter, Tumblr, and the Facebook vanity URL, or whatever they call it.