No Blatent Self Promo: It is proper netiquette to refrain from blatant self promotion in forums and discussions.
Recommendation Books: It is proper netiquette to recommend books to your friends.
No Self Reviews: It is proper netiquette to refrain from reviewing your own book because it is a biased review.
Author Picture: It is proper netiquette for authors to post a profile picture.
Discussions: It is proper netiquette to join discussions by posting and responding because it encourages everyone to read more books.
First, No Self Recommendations. So, proper netiquette to refrain. Hence, no recs for our own books to contacts. Yet, mailing list or announcement and ads are alright.