What you need to know – 03/11/11

Now Kyle Conroy, a computer science student at UC Berkeley, has made the ultimate buyer’s remorse chart. Conroy shows exactly how much money you would have today if you had purchased Apple stock instead of Apple products. It’s painful. 

Foursquare announced Thursday that it has partnered with American Express to bring a pilot specials program to the Austin area during SXSW 2011

Gmail users are younger and more likely to be more tech savvy than any other group, according to a survey conducted by Hunch.

Instapaper 3.0 launched, bringing a host of sharing and discovery features to what was once just a spartan document reading application.

Radian6, a social media listening, engagement and insight platform provider, has acquired 6Consulting.

RadiumOne, the latest project of serial entrepreneur Gurbaksh Chahal, closed a $21 million Series B round of funding led by Crosslink Capital, with participation from DFJ Esprit and existing investors Adams Street Partners and Trinity Ventures.

Rovio, the developer most famous for the wildly popular mobile game Angry Birds, raised a $42 million Series A round led by Accel Partners and Atomico Ventures, with participation from Felicis Ventures.

SecondMarket, a platform to buy and sell private company shares and other illiquid assets, is unveiling a new look and marketplace, designed to broaden the world of secondary market trading to any private company and the world’s investors

Real-time search engine Topsy closed a $15 million Series C round from all current investors, including BlueRun Ventures, Ignition Partners, Founders Fund, Scott Banister and Western Technology Investments.

Today’s featured entrepreneur is Ari Jacoby, CEO and founder of Newsletters.com, VoiceStar, and Solve Media.

Automated affiliate marketing company VigLink completed a $5.4 million Series B financing round led by Emergence Capital. Existing investors Google Ventures and First Round Capital participated in the round.