A recent Piper Jaffray survey found that 9 out of 10 American teens say they use social media, with Instagram being the most popular site. For girls, the site has taken on a special language, becoming a way for tweens and teens to find out what their peers really think of them. Instagram has become a popularity meter and teens are learning to manipulate the levers of success. Need to get up to speed on the secret ways of communicating on Instagram? Take a look at The Secret Language of Girls on Instagram for a beginner’s guide to the acronyms and twists and turns of teenage girl angst online.