Google considered himself to be a spammer.

Recently saw here a link to the cheat sheet on Google services. I looked at it, among the new services for me, studied Alerts - www.google.com/alerts
I set up several alerts on topics of interest to me (related to sports) and set the frequency “as-it-happens” to them (i.e., I get a gmail alert when Google finds something in any source for a given key). What was my surprise when on the second day I found alerts from Google. Alerts on one of the keys in the spam folder of the gmail!
So, they took themselves as spammers. Surprisingly :) So, if someone uses Alerts, sometimes check the “spam” folder, maybe something interesting has accumulated there.