mobile advertising

That's the value a $200 million venture investment led by Kleiner Perkins this week implies. But that means Twitter would have a price-to-sales ratio of 840 compared to Facebook's 26 -- or Google's 8.7. And Twitter's growth may be stalling.

The Federal Trade Commission is set to handle the antitrust probe into Apple's mobile advertising business, after hashing it out with the Department of Justice over who would take the lead.

Federal regulators are looking at Apple's (AAPL) decision to bar some mobile advertising companies -- including Google (GOOG) -- from selling ads on the iPhone, according to the Financial Times.

Google says Apple's new iPhone advertising policies will prevent developers from using AdMob, the mobile ad company Google recently bought for $750 million. AdMob's Omar Hamoui says Google will "be speaking to Apple to express our concerns about the impact of these terms."

Google fires back at consumer groups asking the feds to block the search giant's $750 million purchase of mobile ad firm AdMob. Google says the deal won't dampen competition, and besides, its rivals have already done similar deals.

With all the gloom in the global economy, I got to wondering whether there is anything else going on in the world of business. I'm looking for growth because I think that's what will ultimately bring the economy out of the doldrums. Not surprisingly, that growth is coming from technology companies....