in the example, clicking on "hearts" takes you to the hearts football team website,,,,which has nothing to do with the context of how heart was used in the sentence.

Mark Jones, that's the problem of the auto-linker: it choses its phrases by looking at what Yahoo considers significant, and it choses the result based on what Yahoo (or, as second option, Google) have as first search result for this phrase. There's no human editor to chose the best link – but then again, if you can do that, you don't need the auto-linker. It's more of an interesting experiment which may work if you don't want to specifically control all links.