Facebook's biggest critics often point to a weak mobile strategy, and the critics got a boost when eMarketer reported that Twitter topped Facebook in mobile ad sales game. Of course, the year isn't over and so the eMarketer figures are just projections but it estimates Facebook's mobile ad sales at $72.7 million for 2012, with Twitter coming in at $226.4 million.
But eMarketer says that next year Facebook will be back on top, but still behind other companies: "Both companies earn far less mobile revenue than companies with more established mobile ad platforms like Google and Pandora, though growth in mobile revenues at both social networks is expected to remain high throughout the forecast period."
Twitter has been on an announcement spree lately. Most recently, Twitter said it would expand the Discover tab. Twitter added the tab last December, billing it as a place where users could go to find tweets that were relevant to them. Now, according to a blog post, "when you visit the Discover tab on twitter.com, you'll see a continuous stream of Tweets, which automatically expand to show you the most relevant stories and most engaging photos."