Seventeen (http://www.seventeen.com/)

Teen girls typically begin to pick up Seventeen magazine well before they’re actually 17. This is also probably true of its companion website, which is easily accessible, instantly engaging and bursting with entertaining activities with universal girl appeal. Boy talk, fashion, celebrities, gossip, quizzes and contests will not only draw them in, but keep them riveted for a while. Mixed in with the fluff about beauty products and fashion makeovers are some relationship topics that might be better suited to the older teen, including a “hook-up handbook,” “flirty text message ideas,” and “30 days to making him yours.” There’s no shortage of Q&A. Users over 13 can create a free account in order to post questions or provide advice. Topics run the gamut from “Do boys care about chest size” to “What should I wear to my winter formal." Though advertising is rampant (and often cleverly disguised as contests, fashion finds and featured products), the website masterfully speaks to teens in a relatable voice and touches on the subjects that are top-of-mind for girls. But once they’re here, pulling them away may prove tricky.

Online interaction: Questions posed typically are about topics that teens can easily relate to and cover the basic issues, from dating and sexual relations to fashion and friend troubles. Those who post answers are frequently supportive and encouraging, but because the Q&A forums are unmoderated, there is strong potential for inappropriate language and offensive posts.