This is not surprising to me. Facebook just eats my time everytime I get on there. I now go there only about twice a week. I would rather spend my time on sites such as hn.

From the point of view of the head of a top US company, do you think that if they had such accounts that they would actually do whatever writing showed up there? Many don't even do their own email--this even extends to low-level managers in some large companies I know.