It's a great idea...and has been used by a variety of people for quite some time. Ghosted websites are good, but one can also go to websites that permit comments - or, for that matter, forums - and use a variety of rhetorical tools to modify or control the discourse.
One nice artifact of such actions is the impact on Google. Let's suppose that we want to promote Country Captain Chicken MREs. If we have a single website, someone searching for MREs probably wouldn't notice. But if we have a dozen or so sites, and we introduce links onto and between sites, all extolling the culinary virtues of the MRE, then searches will tend to find lots of positive comments - and, they will be at the top of the list.
Add in some forum posts, apparently from different posters, on a variety of sites, and one can expect a run on vintage MREs.
Back in the good ol' days (about 1995?) it was possible to forge usenet news postings such that the headers appeared to come from a source other than the actual one. The nice part was that at the time, there was no record of the actual origin. So one could create a great many posts to create an impression, all from seemingly unique posters.
With regard to the specifics of psywar in English, I suspect it is intended to counter the abundant negative material already present. I strongly suspect (but do not know) that the other side uses a variety of techniques to gain through politics and swaying public opinion what they could never accomplish on the battle field.