Tumblr beat out Facebook in a recent survey of what teenagers use online. Inspired by Branch co-founder Josh Miller's recent post about how his 15-year-old sister uses the Internet, Y Combinator partner Garry Tan surveyed a bunch of teenagers and young adults to find out which services they use regularly.  With help from YC-backed Survata, Tan surveyed a total of 1,038 people from two different groups: people aged 13-18, and 19-25.  Here's what he found: Tumblr is the most used site. 59% of all respondents reported using Tumblr regularly, while only 54% reported using Facebook ... Read More