http://diegobasch.com/42-of-us-internet-users-have-a-faceboo...
I would say that knowing the absolute reach of as many channels as possible is important including billboards etc. If you expect a 0.5% conversion rate, as long as you filter out ones that reach less than a million people a week, all of your options represent a serious return.
TV advertisers are restricted to one way flow of information, so advertising is about building brand. It's difficult to convert this into conversions. On-line advertising however have accurate statistics because of the available analytical software. Advertisers stick to conversions only as it's still a wild west when it comes to accurate impressions (even Facebook has been caught cheating on viewer counts). Until advertisers cater to surfers the full potential of on-line advertising won't be realised.
I assume it's what caused the shortfall in Google IO's graph, I personally feel on-line marketing understated as a medium.
Seriously, did you have something to add to the conversation, or are you just pointing out random things everyone knows?
I ran a pricing survey there a while ago and a lot of people were willing to pay 11111111111 or 12345 dollars per month.
Back in 2008, I created some accounts for fun to see how Facebook worked, began sending out random requests first day to 4-5 people, next day to 4,5 people. On the third day I had more than 40 friends and was in a circle in some other country and people began writing on my wall asking how I am. Lame.