Many players spend an inordinate amount of time on twitter or facebook posting hundreds of of times to one or both a day. Yet, those same players have no or nearly no activity on the other nets: YouTube, blogs, Empire Avenue. There are also a few who post to Empire Avenue only. To have decent earnings, it's much easier to post a lot less, but on more networks.
Ideally post to five networks a day. Make at least five to eight posts on each. Be careful about posting more. Maybe spread the posts out during the day, if you want to post a lot. Too much could be interpreted as spam, especially on a blog.
My experience is that making five posts to each of five networks will give earnings good enough tat one does not have to campaign for buyers. There will be buyers and the stock will be up most days.