Hi Chris, interesting argument! It would be good if you provided hyperlinked references in the post as some of the things you said I wanted to see some back up evidence for. I didn’t think it would be that painful to store a lot of data, although your point about security is very valid and you are definitely right that some patrons would HATE recommendations (just as some really love Amazon’s recommendations). Do you think users who would be cranky about libraries storing their data would be more cranky about a 3rd party doing it though?