Research firm Piper Jaffray has polled 6,500 teens in the U.S. about social networks and has found the messaging app Snapchat to be the preferred social network for teens. 28% of those queried claimed SnapChat is the most important social network, followed closed by photo sharing app Instagram at 27%. Twitter was third on the list at 18%, followed by Facebook at 17%. Tumblr was a distant fifth at 2%. Apple also remains a hot tech brand among teens. The survey found 69% of teens already own an iPhone, while 75% say the iPhone will be their next smartphone purchase. Interest in the Apple Watch is far lower, with 10% of teens saying they plan to buy one.