Its a very cool app. I was a bit taken aback when I read the recommended ages (as the kids I know using it are under 13). That said there are some good suggestions here in regards to privacy.
Common sense media is a good resource. Check out their "do you know what 420 means" article? Are you in the "weeds"...?
"just a dad"
"Just a dad" Comments and thoughts from a divorced dad's point of view.