I've gotten two kinds of offers because of my Github account. The first is a genuine, honest-to-goodness message written by a human in HR that thought my skills were a good match for their company.
The second arrived late last night and appears to be an automated message from Githire[1], though a real name was used in the From field.
I think this is a new trend and while I don't mind it at all now it could easily get out of hand.