Invisible
Posting Mad!
25% of views come for mobile devices, another 10% use adblock or get an in-vaild ad.
The 50-80% I got from the CEO of a network I worked with (mid 2012) called Xenia FX.
Im pretty much surprised that only 10% using adblocks (i thought its bigger %), however this percent will be increasing i guess paralelly with the increasing amount of ads on Youtube