Today: Yahoo (YHOO) confirms $1.1 billion deal for Tumblr, but faces a quandary about content vs. advertising. Also: SolarCity's big gains continue, Apple (AAPL) rebounds ahead of CEO's testimony.

The lead: Yahoo confirms Tumblr acquisition, but marriage has some issues

A picture taken on May 20, 2013 in Paris, shows logos of the brands Tumblr and Yahoo! on the screen of tablets. Yahoo! bought today the popular blogging
A picture taken on May 20, 2013 in Paris, shows logos of the brands Tumblr and Yahoo! on the screen of tablets. Yahoo! bought today the popular blogging platform Tumblr for $1.1 billion. AFP PHOTO / FRED DUFOURFRED DUFOUR/AFP/Getty Images ( FRED DUFOUR )

Yahoo announced Monday that it is buying Tumblr, confirming reports during the weekend that it was performing its largest all-cash deal in a long history of acquisitions by paying $1.1 billion for the blogging platform. While CEO Marissa Mayer