I spent the day applying for jobs at reputable, big companies.  A couple of hours later I received a call from this number and the person asked for me, I said yes that's me, and he identified himself as being from some job site or another. I don't remember the name.  He asked if I was looking for jobs in my city. I said yes, very skeptically, but that I had not requested any contact from any kind of recruiter. He said "don't worry about it then" and hung up.  Very creepy.