Alf's Zoo - This week, the Zoo learns about the evolution of social media from Eric Tung, who's been sharing and engaging online for years. Starting as a cool toy, social media is now a key ingredient in any business' success. Actually, our hopes for steady employment is affected by the digital footprint we leave behind. Just like customers walk into stores armed with all the information they need to make a purchase, companies know you better than you think. If Target can figure out that you are pregnant based on buying decisions, Google has a pretty good idea if you'll fit the Borg.