So... Is it stalkery to make comments on blogs that mention your book? Y'know, just a "Hope you enjoy it!" kinda comment?
Google Alerts may be the devil.
The Tenners group I belong to have talked about this. The group is split on it; some of them send a personal email, some comment, and some just don't do anything. I'm torn about it, even though for my target audience it's not going to be much of an issue.