Posts by non-friends which mention you appear in Friends timeline
Your friends timeline is meant for people you are following and the posts they boost. If you have accounts you do not follow repeatedly @mention you it serves as a Denial of Service on your Friends timeline because you can't see the posts which are only by your friends.
It seems to me that your mentions (unless they're from your friends) should only be in the notifications panel from which you can open the entire conversation if you want.
An option to at least control this behavior is strongly desired if the current behavior isn't deemed a bug.