Perhaps I'm one of the few, but I always check the location-URL that shows up in the statusbar when you hover over a link. Just to avoid people showing a link to "site.be" which would in fact direct you to "random.be". By doing so, you'll learn a lot about who 's tracking your clicks etc.
But not everyone makes it so obvious to decipher it, and that includes our beloved Facebook. Take the screenshot below, for example. I hover over the "F.lux" URL, and the statusbar shows that I would be redirected to the URL I was expecting.
By simply decoding the URL-encoded chars, it's obvious what the real link is:
Here's what such an URL actually looks like.
<a href="http://stereopsis.com/flux/" target="_blank" rel="nofollow" onmousedown="UntrustedLink.bootstrap($(this), "833ba", event, bagof(null));">F.lux</a>
I'm not sure how long this has been happening, but I've only just recently noticed it. Probably because the redirect-page took slightly longer to load, and thus showed the actual URL in the browser.
All things considered, it's a good way to hide your tracking. I'm worried whenever I see a link that differs from what I mouseover, and I feel more "at ease" (no matter how much trickery is still at play) when I see that they match as I would have expected.