Get on Twitter real-time search. Search for people saying shit like "I'm gonna fire that stupid bitch", "what the fuck are my employees doing all day?", "soon to be unemployed John was on facebook all day again" or "is it wrong to read my employees email".. etc you get the point.
Anyway. It don't get more targeted than that. Now hit em in the DMs and hit em hard.
For bonus point. Pretend to be a hot bitch and incentivize with boobies.
Obviously not as good as the Dullspace Cash Machine method above, but it'll keep you busy for a while.