In connection with the introduction of the new antispam filter - Merits - I would like to summarize what antispam filters I have found on the Bitcointalk forum. And at the end of this post, I'll also list some other antispam filtering methods that are commonly used on forums.
In my opinion new members should not be allowed to make more than 10 posts in a day. Currently they can post as much as they want after 360 seconds each.