Lately I am flooded with Yahoo groups spammers and I have never gotten a response out of Yahoo. I've never got a response from Microsoft with regards to MSN or Hotmail spammers. I have gotten responses from Google and they've shut down the spammers in question. Our experience is not all encompassing While I could make noise about the above, I don't believe either entity either encourages or tolerates spammers. My experience suggests that spammer methods arrive in waves. At one time I was flooded with yahoo messenger spam bots. Before then were the ICQ bots. More recently it's Twitter bots. Technology evolves, services and APIs become available and more prevalent. Spammers discover them and flock to them. Report it and deal with it as best can.