well when u get fb u can interact with ur friends,and u only have to give the personal information u want to give. Furthermore u can make that only ur フレンズ have acces to ur data または pics so its actually pretty safe. Strangers can only see ur pic and dont have to make a pic of urself on ur profile.I never had any problem with fb and I ve never been molested によって other people.
My parents were just like yours. Just ask them to check it out for you! If they don't, ask some of your フレンズ with a フェイスブック to write down reasons why. :)
There are privacy setting on フェイスブック so only the people あなた friend are able to see your profile. It's completely 安全, 安全です if あなた don't add people あなた don't know!