Heise Online worked out a solution[0]: a two-click Like button. The first click replaces a placeholder with the official Facebook Like button. Facebook objected at first, but only because Heise tried to make their placeholder look official. A quick design change allowed them to keep it.
Yeah that's why I'm not sure. It could be attacked depending on the country I guess, and if you don't use a facebook-like icon, its hard to tell what you're going to like. Debatable I guess
[0]: http://news.ycombinator.com/item?id=2957119