Kevin: Some great examples of practical data and mapping applications for the 2010 Afghan elections. TileMill allows different sets of data to be overlaid on top of each such as fraud measurements over maps of election-related violence. Excellent examples of getting more information from mapping and datasets

Kevin: Scott Rosenberg has an excellent guide to how to dig in a website and find out who owns it. It's a great primer for web journalists in some basic investigative techniques to you know who's behind what you're reading online.

Kevin: Frederic Lardinois questions that numbers behind McDonald's claims that Foursquare helped it increase foot traffic by 33%. The numbers don't add up. Check-ins increased by 33% but most likely not foot traffic. Frankly, the check-ins might have started from a very low base, accounting for the double digit increase.