Yahoo topped headlines on Monday, filing a suit against Facebook over patents related to its ad network, privacy, customization, messaging, and social networking as a whole. Yahoo said it has filed thousands of patent applications since 1997, but the Facebook suit focuses on about a dozen particular technologies. A Facebook spokesman suggested that Yahoo made little effort to resolve the issue before resorting to litigation.

Meanwhile, Apple is facing new legal issues over Siri, the voice-activated digital assistant in the iPhone 4S. A New York man is suing the iPhone-maker for what he alleges are intentionally misleading Apple ads promoting Siri's capabilities. Frank Fazio filed a class-action suit on March 6 with the U.S. District Court in San Jose, Calif., claiming that Siri doesn't come close to performing the functions as well or as consistently as Apple advertises it doing.

And, Twitter said Monday that it has acquired micro-blogging service Posterous, but will leave it up and running. Posterous, founded in 2008, is a simple blogging platform, known for its mobile app. The company's entire purpose in life is to "help you share easier," the company has said - somewhat mirroring the goal of Twitter, whose entire platform is built upon users sharing short bursts of content and pictures.

Also making headlines on Monday:

• Apple TV, Google TV ... Could We Soon See Intel TV?: Intel has reportedly been pitching media companies for the past several months on a Web-based television service using a set-top device the chip giant is building.
• New iPad Sales Estimates Top 1 Million, Wait Time Now 2-3 Weeks: Piper Jaffray senior research analyst Gene Munster said his firm expects Apple to sell more than 1 million iPads on March 16.
• Ray Kurzweil Debunks 'Exponential Returns' Doubters at SXSW: On Monday at SXSW, Kurzweil took on the skeptics with an array of historical charts, future forecasts, and the simple belief that "you can start world-changing revolution with just the power of your ideas and everyday tools."
• Aereo Bets on Personal Use in Response to Broadcaster Suit: The startup has filed a formal response to a suit by major broadcasters earlier this month, basing its response on the 2007 Cablevision remote DVR decision.
• Kim Dotcom: Megaupload Users Include 'High-Ranking' U.S. Officials: "Guess what—we found a large number of Mega accounts from U.S. government officials, including the Department of Justice and the U.S. Senate," indicted Megaupload founder Kim Dotcom told TorrentFreak.
• Most People Ignore Friends' Political Posts On Social Networks: With November quickly approaching, Facebook is rife with election chatter, but a new study finds that even when Facebook friends disagree with each other's posts about politics, they tend to ignore the content.
• Hands On With the New GarageBand for iPad: For some, GarageBand will be reason enough to buy an iPad.
• Bahrain, Belarus Added to 'Enemies of the Internet' List: Other countries on the Reporters Without Borders list include Burma, China, Cuba, Iran, North Korea, Saudi Arabia, Syria, Turkmenistan, Uzbekistan and Vietnam.