Dumb question, but doesn't Google Trends cover searches, not traffic on the actual domain? Are we just assuming that the ratio of searches:traffic is pretty much the same for both sites?
Yes, you're absolutely right. I made that assumption, and justified it by seeing that Compete's numbers matched up well for the past 12 months (Compete unfortunately only goes back 1 year, hence I went to Google Trends).
http://www.google.com/trends?q=myspace.com,facebook.com&...