Apple's Showcase Steals Spotlight: Tech Weekly

Shares of Apple closed the week down 1.07% at $574.13.

Facebook(FB) has been a public company for almost a month, and the scrutiny surrounding the social networker's business has been nothing short of incredible.

Recently, for example, digital market research company comScore(SCOR) said that Facebook's ads will deliver significant results for advertisers.

"We found Facebook fans had significantly higher percentages of purchasing," Andew Lipsman, comScore's vice president of industry analysis, recently told Forbes. "It proves Facebook earned media and advertising are driving purchase behavior."

Facebook accounts for 90% of all time spent on social networking sites, according to comScore.

Shares of Facebook jumped 10.75% this week to finish at $30.01.

Microsoft(MSFT) made headlines this week as speculation swirled that it would acquire enterprise social network Yammer.

The Wall Street Journal reported that an anonymous source said Yammer had agreed to sell itself to Microsoft for $1.2 billion, but the newspaper added that the source said it was unclear when the deal would be completed and announced.

There has also been speculation that the software giant might announce its own tablet.

AllThingsD reported Microsoft may come out with its own tablet, as it seeks to take on Apple's iPad. Citing anonymous sources, AllThingsD reported that Microsoft's tablet would run on ARM-based processors as well as traditional PC processors.

Microsoft is making an announcement in L.A. on Monday where its plans are expected to be revealed.

Shares of Microsoft closed the week up 1.25% at $30.02.

Texas Instruments(TXN) shares rose this week after the semiconductor company raised the lower end of its revenue guidance.