Here's the basic story:
Google paid a satelite company to take photos of the entire world for their new project "Google Maps".
The new images included pictures of the area around Groom Lake, which is the supposed site of Area 51. These images were very close up, and showed landing strips, buildings, etc, on land which the government claimed was not used.
Google uploaded these images, and thousands of people began taking screenshots of the area.
Unfortunately taking photos of any area around Groom Lake is illegal, and so Google were told to take the images off, replacing them with very blurry pictures instead.
Unluckily for the government, they couldn't stop all the people who had taken screenshots from distrubuting them.