Facebook's been doing this kind of thing for awhile, but I think it will ultimately damage them in the long term, regardless of whatever short term effectivenes

Facebook's been doing this kind of thing for awhile, but I think it will ultimately damage them in the long term, regardless of whatever short term effectiveness their metrics show. With these emails, Facebook is acting like a desperate, clingy ex, which encourages negative emotional associations to their product when none may have existed.