What's interesting is that this study is an extrapolation (n=5112), but it suffers from selection bias in the sense that the people who would avoid using social networks would also like just hang up on the survey caller (I hung up on 4 this past month).

Add that to all the fluff-piece/marketroid sounding "survey results" like this:

"Read more about Facebook activity and Facebook “power users” in our report, Why most Facebook users get more than they give"

...pretty much make me wonder what questions they asked, and how much the prodded the recipients of the call to ask if they used social networking.

Surveys should state how many calls they placed successfully in order to achieve the (n) of respondents. That's information that's being thrown out.