Glad to know I wasn't the only one - I've been checking my FB stats quite a bit throughout the day because I was testing some new ads and tactics...I had several hundred clicks on an ad as of noon-ish, and when I checked again around 5 or 6PM, it said I had received maybe a few thousand impressions and no clicks. My spend also dropped to $0.71.
Pisses me off because it makes their reports useless, but I may have gotten a few hundred clicks for free. I was already planning on taking a break from FB for a few days to figure out my next strategy, so I haven't tried to submit any ads.