"This needs a little more context, doesn't it? Did usage drop because the app is unpopular? Did it drop because the Guardian is unpopular? Or is Facebook losing

"This needs a little more context, doesn't it? Did usage drop because the app is unpopular? Did it drop because the Guardian is unpopular? Or is Facebook losing share overall?" None, FB launched the opengraph plugin with a preferred list of partners, after the initial bedding in period other media companies were allowed to join, thus saturating the market and taking % share (UV).