Groupon has hired former Amazon.com VP of Finance Jason Child to work as their CFO. He had spent 12 years at Amazon.com and was most recently in charge of Amazon’s $14 billion International business. Before Amazon.com, Child worked at Arthur Andersen for 7 years. “Groupon is one of the most amazing businesses I have ever seen. I am thrilled to join a great team that is attacking one of the biggest opportunities in e-commerce today,” said Child. [TechCrunch]

Sulia is a website that finds and sorts influential Twitter users and groups them into categories. It is a good starting point for Twitter beginners. Sulia has raised $3.5 million in a round led by FirstMarket Capital. Other investors in this round include Village Ventures, IA Ventures, Founder Collective, and SV Angel. Sulia used to be known as TLists. [AllThingsD]

Google Inc. (NASDAQ:GOOG) user experience researcher Paul Adams has joined Facebook to work on the Groups product. “After ~4 years in the awesome Google UX team it’s time for a change + I’m excited to be joining Facebook in the New Year,” said Adams in a tweet. Facebook has successfully poached engineers and valuable execs from Google for years now. Adams is known for compiling a lengthy report that criticizes Facebook called “The Real Life Social Network.” This report points out the deficiencies Facebook has at separating work friends from personal friends. The Real Life Social Network report is embedded below:

Researchers at the Boston University School of Public Health said that e-cigarettes are much safer than normal cigarettes. E-cigarettes are nicotine inhalers to help cigarette smokers quit the bad habit. The BU researchers said that there are “few, if any” chemicals in e-cigarettes that have serious health risks. Carcinogen levels in e-cigarettes are thousand times lower than in real cigarettes. But one of the biggest advantages of e-cigarettes is demonstrated in the below video:

Super Talent has announced a new USB 3.0 500GB Storage Pod. This ultraslim black box can transfer files using SuperSpeed USB as it can transfer files at up to 90MB/second. You can buy it next month for $99. Check out the video demo below:

The SEC is investigating the departure of former Hewlett-Packard Company (NYSE:HPQ) CEO Mark Hurd. Hurd is believed to have shared inside information with a former H-P event hostess in 2008 about the company’s $13.9 billion acquisition of EDS.

Social gaming company Zynga has launched Mafia Wars Atlantic City on mobile devices. This is Zynga’s first HTML5 game made for mobile devices. Mafia Wars Atlantic City works on the iPhone, iPad, Android, BlackBerry, and WebOS. You can play Mafia Wars Atlantic City by visiting the website m.mafiawars.com. You can also download it from the app store on GetJar. Zynga plans on launching the Zynga Poker game on Android soon. [VentureBeat]

The metals hooks on the Kindle Leather Cover sold by Amazon.com, Inc. (NASDAQ:AMZN) conduct electricity and is causing problems for the Kindle devices. Amazon.com told PC Magazine that their engineering team is looking into it and is offering a refund or replacement to anyone having a problem with the case. [PC Mag]