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iPhone 4S and iPhone 4 owners can compare what they' have gained from upgrading to the latest version of iPhone while iPhone 4 users can see what they are missing by not owning 4S.

Take a look at some of the most talked about events, news, moments of 2011 in form of tweets.

Which girl doesn't scream in the presence of Justin Beiber? Even dudes do! like teenage female fans!... The 30-second Macy's new winter holiday commercial promotes the store's Black Friday sale and Bieber's "Someday Gift Set," featuring the Canadian pop sensation's new Christmas album and perfume. For each gift set sold, Macy's plans to donate $2 to the Make-a-Wish Foundation, up to $200,000. The Video already has 92,000 views since its Nov. 15 release.

Is it hard to meet an investor these days? The founder of Undrip, Mick Hagen, a stealthy startup in San Francisco that is building a service to better filter your Twitter stream, is trying to get the attention of top angel investors with the rap video above. The video doesn't say anything about what the startup does other than it's the "biggest move I've made since I dropped outta Princeton" and we'll be crushin it from NDA to IPO. if this video doesn't work, they have 20 more addressed to individual super seed investors. Other investors who can be expecting a personalized pitch in rap form include Ashton Kutcher, Dave McClure, Michael Arrington, Keith Rabois, Kevin Rose, Chris Sacca, and Sean Parker according to Techcrunch.

Tony Fadell, Apple's iPod inventor talks about his latest invention- Smart, sexy and user-friendly Thermostat

The Twelve South team, the company responsible for iPhone cases like the BookBook and stands for the iPad and MacBook Pro, has just unveiled their newest creation, an ingenious a 10W USB wall charger that seamlessly connects to a standard MacBook Air or MacBook Pro AC adapter. aIt is a totally unique, all-in-one, dual charger for MacBook + iPad or iPhone. That means you can charge your MacBook + iPad or iPhone at the same time using one wall outlet.

Facebook founder Zuckerberg talked about Facebook's Journey and gave some tips to the budding entrepreneurs in Silicon Valley

Conan O'Brien stopped by Google's Mountain View, CA headquarters for an interview with Google's Vic Gundotra and and left the audience in splits. This event took place on May 5, 2010.

Gmail to get a new look. Take a look at the details accidentally leaked by Google in the video.