A week after the 2012 elections, here's a look at some of the changes in the social- and digital-media landscape in the U.S. since 2008. Here are eight developments worth noting:
1. Facebook: 2008 was, indeed, a long time ago. At the end of that August, Mark Zuckerberg announced that his service had crossed 100 million users, a far cry from the billion milestone it would hit within four years.
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