Over the past four years, which U.S. industry has produced the fastest job growth? The internet publishing, search and social media industry—from giants such as Facebook and Google to startups such as Pinterest–has seen a 44% gain in domestic employment since 2008, far outpacing the rest of the economy.*
This fits in with the rapid growth of App Economy jobs, which totaled 519,000 in April 2012, up from nothing in 2007.
*(Based on 5-digit NAICS codes, as reported by the BLS, measured from July 2008 to July 2012. Calculated previous to the release of the September job report).
Added: The internet industry is NAICS code 51913. See here for a full list.