It does exactly what it says and hides what you tell it too. I'm only giving it four stars though because it doesn't work on individual tweet pages - meaning if you click on a tweet so it opens into it's own page, it won't hide the replies to that tweet even if a reply contains something you tell it to hide. If it could be made to completely hide anything anywhere, then I would definitely give this 5 stars, but either way, I still think it's an essential addon for twitter!! PS, I have never had any of the problems described in the other reviews. PSS. PLEASE MAKE THIS WORK ON TWEETDECK!!