as oppose to just link directly to your main site, would it be more efficient if you create few (about 6-10) 2.0 properties and blast on those sites? How is it work? well, since many services do that, i assume it works, but just wanna be confirmed. and, my guess is that, if linking directly to main site gives score of 10, linking to the main site via 2.0 still gives same score? and is it safe to blast 2.0 properties if they are high PR like facebook, youtube etc and link to the main site from these 2.0 properties?