Facebook is rapidly sliding in importance among teens, while Snapchat and Instagram are soaring, according to a new survey from Piper Jaffray today. Only 14% of teenagers consider Facebook the most important social network, down from 23% a year ago and 33% in 2013, according to the investment bank, which surveyed 6,200 teens. The average age of respondents was 16 and 35% work part-time. About 13% of respondents picked Snapchat, while 32% answered Instagram. Read full article here.