yea, we had two or 3 recent "likes" that appeared to be inactive or junk/spam facebook pages....no activity, no pictures, the only other likes were spam/junk websites etc...ie they didnt actually reflect a valid persons facebook page....we also noticed that both the recent "odd" likes were only friends with each other...thus making it seem very odd.
We wound up giving the 2300 award to the most recent like that appeared to be from a valid and active personal facebook page.
Im also pretty sure we lost some more awahile back as we were previously going for 2530...so im thinking facebook is deleting lots of the fake facebook profiles...who knows.