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Twitter Sales Estimate Cut by EMarketer on Slower Ad Rollout

Twitter Inc.’s advertising revenue will reach $139.5 million this year, according to EMarketer Inc., which pared its estimate from $150 million because the microblogging website has been slow to roll out some services.

Twitter hasn’t yet added expected advertising products such as a “self-serve” platform that lets customers set up their own ads, the research firm said in a report. Still, even the reduced estimate means ad revenue may more than triple in 2011, and sales will rise more than expected in later years, EMarketer said. Global ad revenue is predicted to reach almost $400 million by 2013.