Facebook’s push to generate more revenues from mobile ads seems to be getting results but not nearly enough to dent Google’s share of total mobile ad revenues. Business Insider points us to new research from eMarketer showing that Google has accounted for 53.2% of all mobile ad revenues so far in 2013, an increase from its 2012 share of 52.4% of all mobile ad revenues. What makes this particularly impressive is that Google has held onto its share of mobile ad revenues even as Facebook has seen its share of mobile ad revenues surge from 5.4% in 2012 to 15.8% in 2013. In other words, it seems as though Facebook’s rise in mobile ad revenues is much like Bing’s growth in the search market: It’s taking away shares from smaller players but not doing anything yet to hurt the dominant market leader.