The latest growth figures for social networking from comScore are neatly presented in a chart next to USATODAY's article on the subject (which I blogged about here). Though the chart doesn't say, I'm assuming these are all US numbers because they're in USATODAY. Anyway, at a glance...
* The percentage of all Net users (all ages) using social network sites has grown from 69.6% a year ago to 77% this past August.
* The total number of Internet users was 189.1 million in July 2008 and is 195.5 million now.
* The total number of online social networkers in July '08 was 128.5 million, up to 147.6 million this past July.