Tablets are adding to the vast inventory mobile ad networks are trying to fill. In an effort to provide greater targeting among tablets, Jesse Marmon Haines, group marketing manager, Mobile Ads, Google, said the company will expand targeting for its AdWords program beyond the iPad to other tablets. Earlier in the day, keynote speaker Chris Needham of Fidelity Investments pointed out mobile ad networks are well positioned to capitalize on the current ineffeciency of tablet advertising as an emerging ad category. But fill rates for mobile advertising overall are only running at about 20%. That ain't very efficient.

In case you're wondering, Groupon Chairman Eric Lefkofsky has full confidence that the company will be "wildly profitable," Bloomberg reports. Good thing considering the daily-coupon provider just filed its IPO. Still losing money, Groupon said last week that it plans to raise $750 million in an initial public offering. "While sales at the Chicago-based company surged more than 14-fold to $644.7 million last year, Groupon has also amassed $540.2 million in operating losses since its founding in 2008 and its costs are rising faster than revenue," Bloomberg reports. Meanwhile, some have raised questions about Lefkofsky's professional track record. Prior …

If and when Microsoft is allowed to buy Skype, what will it do with the Web-calling company? And how might the deal impact the state of Net neutrality at home and abroad? The New York Times, for one, doesn't have answers or either question. Some experts tell the NYT that Microsoft will likely intensify Skype's lobbying efforts in Europe, "providing a strong ally in a fight that could require European operators to open their networks to economic competitors." Others, however, expect Microsoft to retreat, "either dropping Skype's critical line of argument in Brussels or striking a deal to share …

Microsoft announced Monday at E3 in Los Angeles that it will make Bing, the company's search engine, and Google's YouTube available through Xbox 360. The company released its vision for television coming this fall, as well as how voice commands will drive search on a variety of networks. These changes aim to make Xbox an entertainment system, rather than game console.

In another case of Facebook unleashing its wrath on an unsuspecting user, some 16-year-old girl in Germany mistakenly invited over 15,000 "friends" to her birthday party after forgetting to set the privacy settings on the invitation. The mistake began when the birthday girl, identified as Thessa, published an invitation meant to invite only a few friends over to her house," reports the NY Daily News. "Instead, 15,000 people checked that they would be there – and her parents promptly cancelled the party." Despite the cancellation, more than 1,500 guests and 100 police officers showed up to the party. As …

Do foreign-born social networks stand a chance here in the United States. We could soon find out as China's Sina Weibo reportedly prepares to release its Twitter-like microblogging platform in English in as little as two months. First reported by Chinese tech news resource TechWeb, The Next Web notes that Sina already announced plans to monetize its popular service and since then has been very active with rolling out new features. "Probably the most conclusive piece of evidence to support the rumor is the introduction of an English version of its iPhone app last month," writes The Next …

Food marketing giant ConAgra has selected Publicis' Spark Communications as its digital media agency of record following a competitive review. Effective immediately, Chicago-based agency will handle all digital media planning and buying responsibilities on behalf of ConAgra Foods.

Baltimore-based Under Armour has selected Omnicom Media Group agency Optimum Sports to manage its media account, marking the first time the sports apparel marketer has assigned media planning and buying duties to an outside agency. Among Optimum Sports initial responsibilities will be advising Under Armour on the placement of its upcoming footwear TV, print and digital campaign, which will kick-off during the "back-to-school" shopping season.

Aegis said it is in talks with marketing research firm about possible a possible sale of Aegis' Synovate research unit.

The National Retail Federation reports that consumers are more willing to dabble in social commerce than many retailers realize, with 42% of those who shop online saying they at least occasionally "follow" a store on a social media. More than 56% of Facebook users have clicked through to a retail site, while 67% of Twitter users have done so. The study, based on more than 1,700 online shoppers and a joint effort between the NRF's Shop.org e-commerce unit, comScore, and Social Shopping Labs, found that those online shoppers who track retailers typically follow six stores, whether through Facebook, Twitter …