Let me tell you a curious story of rise and fall.
On April 10th, my Adsense earnings went to the roof. I couldn't tell the reason for that, but I decided to be glad and do not bother about it.
Much to my surprise, my earnings kept going up over the last days (with a quick weird drop on the 16th), until they came back to the regular levels on April 20th.
As it couldn't be different, I decided to investigate the sudden drop (yes, only after it started hurting my pocket).
The only unusual thing that I could find was an amazing raise on the number of times the page "?fb_xd_fragment=" was opened on that golden period. For those who don't know, that's an URL that shows due to a bug on the Facebook Like button, which doesn't support some browsers.
The rest of the site's traffic was exact the same, so why the Facebook Like button error started showing up A LOT more often on the logs? And even weirder, why did it impact on the Adsense earnings?
I wish I knew.
Here's a screen shot of GA: [imageupload.org