This questions has bugged me for a while, I constantly hear about employees posting something controversial on FB or Twitter, then later being dismissed from their workplace due to various policies.
I can see 2 situations here:
A.) John Williams works in ABC Bank with a picture of him. He posts something on FB or Twitter that contravenes policy where an employee of ABC reads it and hands it over to HR.
B.) John Doe is a pseudonym for employee John Max on FB. John Doe posts something controversial about a hot topic like ISIS. The company finds out and fires him. HOW?
Latest example:
Here
Not sure how he got caught, but that useless waste of space should've been thrown in the slammer and the key safely deposited somewhere in the vast Indian Ocean.