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Twitter tumbles as user growth disappoints (Update)

Twitter shares sank Tuesday to their lowest levels since the company's market debut after the popular messaging platform reported a jump in revenues but disappointing growth in users.

New US-Spanish firm says targets rich mobile ad market

Spanish telecoms firm Telefonica and US investment giant Blackstone launched a mobile telephone advertising venture on Wednesday, challenging internet giants such as Google and Facebook in a multi-billion-dollar market.

EMarketer sees 2014 mobile ad spending at $31.5B

Worldwide spending on mobile advertising is expected to reach $31.5 billion this year, a 75 percent increase from 2013 thanks largely to Facebook and Google, according to a new report by research firm eMarketer.

Facebook's clout in wireless industry is growing fast

Less than two years ago, disillusioned investors were fleeing Facebook Inc. stock, worried the company would never figure out how to make the leap to mobile devices from personal computers, let alone make money on them.

US mobile ad spending to soar, says eMarketer

Research firm eMarketer expects spending on mobile advertisements to hit nearly $9.6 billion in the U.S. this year, up from $4.4 billion in 2012 and from less than $1.6 billion in 2011 as Facebook and Google barrel ahead.

Facebook testing video advertisements (Update 2)

Investors are giving a thumbs-up to the idea of Facebook making hundreds of millions in new revenue from video advertisements, but some users argue that the social network is already too cluttered and has become more about ...

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