If your child has access to the internet (even if watching seemingly harmless “educational” videos), please educate them about internet safety. Children are being increasingly exposed to online pornography and online abuse such as cyberbullying. It is very apparent that mobile phones and internet are a part & parcel of the lives of young children these days. Just as you would teach them safety rules in their offline lives (crossing roads, talking to strangers), please teach and monitor their online lives also.
http://www.schoolfamily.com/school-family-articles/article/807-internet-safety-tips-for-parents