i found an even more effective method, which is to delete my profile. In seven years if using that site i never got a single meaningful interview from somebody who contacted me on linkedin.. every time i go to a job interview with somebody who found me on linked in, they end up telling me during the interview that they don't think i come from the right background for this position despite the fact that they are the ones who contacted me.

It did however lead to one fairly entertaining interview at a large well-known company that makes virtualization software in which the person interviewing me didn't believe me when i told him that the realloc function exists.