Have you ever gotten job calls from people's facebooks?

This has happened to me twice before. I post my cell phone number on facebook because I know many people with smartphones sync information from facebook, including cell phone numbers. I have had cell phone calls from sales companies calling on behalf of a facebook friend saying that that friend works for them and they wanted to offer me a job. I have heard that this occurs when someone gets a job and they let their employer look through the employee's facebook account and find numbers and call those numbers. Since these people are trying to solicit via cell phones is it illegal. I don't appreciate having telemarketer-like people contact me. Has this happened to anyone else?