This is horrible... that is why I won't subscribe to FACEBOOK etc....
A lot of companies scope you out on facebook b4 interview... so those fun party photos!!!!!!!!!! NO NO

This is disgusting - isn't there a computer whizz who can source the sender....

Don't call it a prank/joke etc.
It isn't funny it is scary and worrying. Someone is following this person, taking photos, hacking their computer and writing obsence messages

If it were me my alarm bells would be like a fire engine.