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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.

Airtime, Sean Parker's new social video chatting service for Facebook, launched today with an event that totally unraveled into a complete fiasco. But what might rankle more than a rocky launch is the revelation Airtime will take “snapshots of users periodically to ensure site safety,” according to an Airtime spokesperson quoted in Forbes.

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.

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.

Although many investors had hoped for a big first-day pop, Facebook's stock opened on May 18 at $42.05 and fluctuated between $45 and $38 throughout the day. It closed barely above its IPO price, at $38.23. Since the IPO, the stock has been down on seven trading days and up on four. Facebook's stock price has gone as low as $26.44 since the IPO.

We've heard rumblings that Facebook was testing a system called Highlight that would allow people to pay to promote a post, and now obnoxiously enough, it's starting to show up.

Facebook's stock has fallen below $30 for the first time since its much-awaited public debut this month.