NEW YORK (TheStreet) -- A number of top executive appointments led the stock-related buzz on social media this week. In other news, Amazon (AMZN - Get Report) made a splash with its move in the "gig economy."

Here's our weekly round-up of the most discussed stocks on Twitter (TWTR - Get Report) and traditional media channels -- stock-related news that saw the highest levels of engagement among market experts and valid sources. 

1. Ralph Lauren (RL - Get Report) : Ralph Lauren announced Wednesday that he is stepping down as CEO of his fashion company. Stefan Larsson, President of Old Navy and a former H&M executive, will be taking over the position.

2. NVIDIA (NVDA - Get Report) : NVIDIA made news today when it unveiled GeForce Now, an $8/month subscription service that allows users to stream PC games directly to their NVIDIA Shield devices.

3. NXT-ID Inc. (NXTD - Get Report) : Biometric authentication company NXT-ID made headlines with their announcement of William Fields to its advisory board. Fields formerly served as CEO of Wal-Mart's (WMT - Get Report)  retail stores division.

4. Hilton Worldwide Holdings Inc. (HLT - Get Report) : Five banks traced a pattern of card breaches to Hilton Properties usage. Hilton is investigating the breach.

5. Tesla (TSLA - Get Report) : While speaking with a Danish TV station, Elon Musk said that he believes Tesla could have autonomous cars by 2018, though regulators could delay that. Tesla plans to have fully autonomous cars with a 745-mile range available by 2020.

6. Comcast (CMCSA - Get Report) : Comcast announced that it is buying a majority stake (51%) in Universal Studios Japan. This marks the company's largest investment outside the United States.

7. Amazon.com: Amazon launched a new service called Amazon Flex which will allow independent couriers to deliver packages ordered for one-hour Amazon Prime Now delivery. The Uber-like service will offer drivers $18-$25 per hour.

8. Reynolds American Inc. (RAI) : News broke on Tuesday that Reynolds American will sell its Natural American Spirit division to Japan Tobacco Inc. The deal is reported to be worth about $5 billion.

9. Coca-Cola (KO - Get Report) : Coca-Cola agreed to alter its VitaminWater labels following a lawsuit alleging misleading health claims.

10. DIRECTV (DTV - Get Report) : Following a change in exchange rates, DIRECTV may be devalued by $1.1 billionin Venezuela. AT&T, which acquired DIRECTV in July for $48.5 billion, is deciding on an exchange rate to use, which could alter the satellite TV provider's valuation in the country.

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