User blog comment:Mira Laime/Introducing long-awaited Discussions updates/@comment-37223231-20190329221544/@comment-5301680-20190330000340

Not bad, but that doesn't prevent spamming. I'm not sure if a person who wants to spam, will realized weather you turned mentions on or off. So it would be better (or even a good combination) to run some checks before posting to make sure that post doesn't contain just a bunch of mentions or a mention and some nonsense text.