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This is an advertisement for Burger King.

In that case you can flag it once you get to 30 karma, or rely on other users to do so. But please don't post unsubstantive comments.

Are there any repercussions for my negative reply to this ad? Or can I keep posting as usual?

Your account isn't penalized, and if you stick to posting only civil, substantive comments from now on, you'll be fine.