Yes, I used GA & getclicky and the results were almost identical. The landing page I was using was extremely lightweight and loaded in less than a second in most cases. I'd be really surprised if people could bounce before it loaded.
I guess it depends on what your selling in the case of my comic click fraud doesn't make sense, and for my job board the majority of my competitors buying ads are major job boards.
If you're working in a more "black hat" corner of the ecommerce world like affiliate links, it's certainly possible that click fraud occurs, I just haven't seen it occurring.
Have you checked the analytics reports that Facebook generate to see if it is the same users clicking the advert over-and-over again ?
By the way, I'm not the only one reporting this issue: http://www.google.com/#sclient=psy&hl=en&q=facebook+...