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.
No Self Recommendations Netiquette Book Networks
What do you think when someone recommends that you buy something and you have not asked about it?
A rec on a book network is a message. Sent to your connections about a book that you have read. It is telling your friends, followers, and online associates.
Book Networks No Self Recommendations
About a good book. Not our own. Else, spam. However, acceptable on micro blogs. It’s an unsolicited advertisement. Intended for works by other authors.
Using the recommendation system of a book network to promote your book is misuse of the system. It’s an unintended consequence of being able to recommend a book to friends. Unbiased. Advertise in other ways by design.
No Self Recommendations Netiquette
It is proper netiquette to refrain from recommending your own book because that is advertising intended for another place.