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Hot Stock Minute

Now a look at some of the stocks the Yahoo Finance team will be watching for you today.

The first is Twitter (TWTR). Turkey's high court said the country's ban on the social networking site must be lifted, saying it violates freedom of speech and individual rights. Prime Minister Recep Tayyip Erdogan banned Twitter on March 21 before local elections in the country were held on March 30. Twitter was used to share wiretaps and documents alleging misconduct by the prime minister, his associates and family members. YouTube was blocked in the country one week after Twitter.

Microsoft (MSFT) yesterday unveiled its long-awaited voice assistant to positive reviews. The Wall Street Journal described Cortana as "Microsoft's sassy Siri rival," a reference to Apple's voice assistant. Cortana, named after the artificial intelligence from the Xbox game "Halo," comes out with some witty responses to questions and tells corny jokes as well. Cortana was announced by CEO Satya Nadella as part of the new Windows Phone 8.1. Microsoft said it will start rolling out the mobile operating system "in the coming months."

Amazon (AMZN) also had an unveiling yesterday. It revealed its new streaming-video device called Fire TV. The new set-top box will allow users to stream video and other media to TV sets and will put Amazon in direct competition with similar products, such as Apple TV and Google Chromecast. Fire TV will cost $99, the same price as Apple TV. A statement posted on Amazon.com said the device will have a "voice search that actually works." Fire TV will also have access to thousands of video games, some free and some for a small fee. The company also introduced a game controller that costs $39.99. Fire TV begins shipping Wednesday.

And fuel cell company Plug Power (PLUG) said it bought fuel cell tech company ReliOn for about $4 million in an all-stock deal. Plug Power stock has been on a wild ride, rising on news of contracts with Wal-Mart (WMT), then falling sharply when one analyst said the stock should be valued at $0.50 a share.

And today is the first day of trading for the new Google stocks after the long-awaited 2-for-1 stock split. Shareholders of record as of March 27 will get two shares for each one they own. The Class C shares will trade under the original ticker, GOOG, but will be non-voting shares. The Class A shares, which will come with voting-rights, will trade under the ticker GOOGL. The move allows Google founders Larry Page and Sergey Brin to maintain control by halting the dilution of their Class B shares, which are not publicly-traded. As of yesterday's close, before the split took effect, shares of Google were up 40% in the last year.