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Legendary investor Warren Buffett has increased his stake in Apple (AAPL) - Get Apple Inc. (AAPL) Report -- in a big way.

During the fourth quarter, Buffett's Berkshire Hathaway (BRK.A) - Get BRK.A Report holding company "added another 42.1 million shares of Apple, bringing its total investment to 57.4 million shares, or 1.09% of the company's stock," Yahoo! Financereported. "That position was valued at more than $6.6 billion at the end of 2016," the news site said.

Based on Apple's closing price of $135.02 on Tuesday, and assuming Berkshire's position hasn't changed, the stake is now valued at more than $7 billion, Yahoo! said.

Tesla Motors (TSLA) - Get Tesla Inc Report has been notorious for finding its way into the headlines. Whether it's because of its fastest 0 to 60 mph acceleration for a production car, self-driving capabilities or its CEO Elon Musk, it's seemingly always in the press. 

So what is it making headlines for on Tuesday? 

The company is apparently selling 200 Model S and Model X vehicles to the Dubai Roads and Transport Authority, which will be used for limousine service with the Dubai Taxi Corporation. 

The company has also opened up a store in Dubai. It also helps that Dubai is looking to increase the amount of driverless cars in the area by 2030. Given Tesla's advances in autonomous vehicle technology, it would have seemingly made the vehicles more attractive. 

Tesla's vehicles also carry with them a certain aura, which likely makes them more attractive for the region's limo services.

This marks the company's first move into the Middle East, a noteworthy endeavor to go along with its recent move into India. Tesla has clearly been busy and investors will be anxious to receive updates when the company earnings reports later this month. 

Shares of Tesla closed at $280.98 Tuesday, up 0.1%. 

Life as PewDiePie isn't going quite so swell lately. Felix Kjellberg, better known as PewDiePie on Alphabet's (GOOGL) - Get Alphabet Inc. Class A Report YouTube, has made his living off of funny and embarrassing skits along with his video game playing and commentary for years. 

Made a living? Yes, and quite a living at that. It's estimated that Kjellberg generating $14.5 million in ad revenue last year alone. That's a lot of money for someone who's only 27, but who has had their videos viewed 14.7 billion times. 

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However, after several anti-Semitic videos not everyone is feeling the humor. Through its Maker Studios unit, Disney (DIS) - Get Walt Disney Company Report had a partnership with PewDiePie. But after his latest posts, the company felt they were best off terminating that relationship. 

YouTube has also taken action. The company has reportedly canceled its second season of "Scare PewDiePie," and has also removed him from the Google Preferred advertising platform. 

Shares of Alphabet closed at $840.03 Tuesday, up 0.1%.

Apple, Alphabet and Cisco (see next item) are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL, GOOGL or CSCO? Learn more now.

Amazon (AMZN) - Get Amazon.com, Inc. Report has seemingly got its hands all over e-commerce. Whether it's ordering toothpaste or buying cloud services, Amazon's got you covered.

But now the company is branching out even further -- and taking on some big-name competition in the process. With its venture into videoconferencing, it's going head-to-head with companies like Microsoft (MSFT) - Get Microsoft Corporation (MSFT) Report and Cisco (CSCO) - Get Cisco Systems, Inc. Report

Now known as Chime, the service features "video conferencing and communications from [Amazon Web Services] that's focused on business users."

Pricing ranges from $2.50 per month per user, all the way up to $15 per month per user, depending on the features customers are looking to get out of the service. For those trying to keep costs low though, there is a free option, but it only includes video calls and messaging between two people. 

While it's sort of reminiscent of Microsoft's Skype, it's got a business element to it too. While AWS caters to companies looking for cloud, storage and web solutions, it's just another element to the platform.

The company is hoping this helps keeps the revenue growth going while also making the platform that much stickier and more attractive to current and prospective customers. Plus, with technology playing a larger and larger role in businesses today, it's becoming more likely that employees will need virtual meetings to keep up to date. 

With Amazon entering the ring, it's looking to capitalize where others have failed and hopefully provide a superior product.

Shares of Amazon close at $836.39 Tuesday, down 0.02%.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.