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Facebook went public last month on its prospects for growth. But in some areas, the social network's growth rates are already maturing. In particular, Facebook's user growth rate in the U.S. is slowing sharply. In April, U.S. unique visitors to the website increased to 158 million, up just 5% from a year earlier, according to research firm comScore Inc.

Stung by claims in recent weeks that its advertising doesn’t work, Facebook is pouring on the public relations to insist that in fact, ads work just fine on the site. But while some of the claims of critics rest on shaky evidence, many questions about Facebook’s value as an advertising medium remain among the brands that constitute the bulk of all advertising online and off.

UBS is sitting on losses that could be as high as $350 million stemming from its investment in the Facebook initial public offering, and is preparing legal action against Nasdaq as a result, people familiar with the matter told CNBC.

Nasdaq OMX Group Inc said it will offer cash and rebates totaling $40 million to compensate clients affected by the problems with Facebook Inc's initial public offering.

A Russian hacker claims to have uploaded almost 6.5 million LinkedIn passwords, The Verge reports. LinkedIn in says in a tweet that "Our team is currently looking into reports of stolen passwords. Stay tuned for more."

Facebook’s post-IPO performance has been poor. But is it so poor that it will hurt the prospects for other startups? The short answer: Almost certainly.

Google Inc. in Mountain View has agreed to buy Meebo Inc., a startup that helps online publishers make their websites more social. Meebo, founded in 2005, announced the agreement Monday on its blog.

China blocks access to the term "Shanghai Composite Index" on some of the country's most popular microblogging sites.

Facebook is considering ways to invite children younger than 13 onto its social network, a controversial move that could bolster the company’s bottom line but also spark concern among regulators over the safety of young Internet users.