Brands to Watch: Amazon, eBay, Twitter and more

Amazon is expected to announced "online media locker" on Tuesday.

Apple's iPad 2 sells out internationally.

EBay is acquiring GSI Commerce for $2.4 billion, intensifying its e-commerce rivalry with Amazon.com.

Facebook depression seen as a new risk for teens.

IBM's Watson has a new job.

Japan's latest quake-related bad news: Radiation has been found outside nuclear reactor, signaling meltdown.

Kraft unveils new Twitter-to-TV marketing campaign.

Lady Gaga is now 25.

Oliver Peoples introduces Gregory Peck frames to commemorate 50th anniversary of To Kill a Mockingbird.

Sprint says it will fight AT&T's bid for T-Mobile.

Target accused of knocking off Proenza Schoeler bag.

Twitter confirms that founder Jack Dorsey has returned to head up product development.

Warner Bros. reveals first poster for the last Harry Potter movie.