Stop and think a moment.
What are a lot of Marketers/SEOs/Advertisers ... if not "fakers"?
And let us not forget our discussion the other day about Confidence.
I could easily setup several different profiles for different "parts" of my life.
I could do one for SEO/SEM,
I could do one for real world marketing,
I could do one for Martial Arts,
I could do one for Gaming,
I could do one for Cookery.
All those things I have pretty good knowledge/skill/experience with.
All I need is a little note file with personality notes, subjects to avoid ... and some themed typing style notes (like my "... ..." and ... usage) as well as some specific words.
That is actually enough to manage most humans.
You then pick and choose some targets;
those that have a high Circle rate,
those that have a high Share rate,
those that have a moderate number of followers that show an interest in that subject.
I, personally, could probably manage 6 or 7 such profiles by myself.
Put me with a team of 4 or 5, and you'd likely see in the region of 40-50 such profiles.
All interacting with their audience, all making valid posts and comments.
Through in a half decent NLP system that has been trained on post styles, with some rough frame worked posts/comments that fill in around previous info ... and I could happily quadrupple that figure, and have the people simply proof and amend.
And alternative is the "many donkeys" approach. You have a ton of people researching, pre-writing ... you simply rephrase and churn out posts and comments.
I've known people on forums and Q/A sites do that ... and it works.
No reason it won't work here.
They key is ... Quality and a bit of effort.
Fortunately, those are two concepts that most spammers don't seem to understand :D
You will see small scale farms working ... and you won't even know it.