eMarketer estimated in December 2012 that mobile ad spending worldwide reached $8.41 billion last year, or 8.2% of total digital ad spending worldwide. By 2016, mobile ad spending will account for 22.6% of digital spend. An increasing share of these dollars will go to tablets and be purchased through RTB [...]

eMarketer estimates Twitter will earn $308.9 million in mobile ad revenue in 2013—which is more than the company earned in total, from any ad type, in 2012, when it made $138.4 million from mobile ads. The bulk of Twitter’s ad revenue is expected to continue to come from the US—about [...]