I sometimes see job ads on facebook. I have no idea if this is true in general, but in my case, I have been surprised at how good of a match they tend to be. I

I sometimes see job ads on facebook. I have no idea if this is true in general, but in my case, I have been surprised at how good of a match they tend to be. I am not sure exactly what characteristics the employers are targeting when they set up the ad campaign, but I can guess based on the fact that one or two of the ads specifically stated that the company employed other Caltech grads (I have a BS in CS from that school).