I don't know what their experimental methodology is, but according to the article, 17% are REQUIRED to do write nice things about their employers in social media and another 27% are ENCOURAGED to do so. That's 47% or about half of all people.
That's just not true. Half of all people are NOT shilling for their employers on Facebook. Perhaps there is some small group in which this occurs, but I see almost no signs of it in my social circles, and honestly, do you see that? HALF of everyone?
I'm not dismissing the issue as unimportant, but I'm dismissing the data from the survey as clearly flawed or else applicable only to some special subgroup.