Do you plan on giving away or selling one of your older mobile devices? Make sure you wipe or reset your device before disposing of it. If you don't, the next person who owns it will have access to all of your accounts and personal information.
One of the most effective methods you can use to protect kids online is to talk to them. The younger you start talking to them, and they to you, the better. Hold regular conversations about online safety issues. If you don't know what your kids are doing or where to start, simply ask. Play the clueless parent and ask them to show you what the latest technologies are and how they use them. Quite often, kids love the idea of being the teacher and will open up.
Be very careful of any lost USB drives you may find (such as in the parking lot or local coffee shop) or USB drives you are given at public events, like conferences. It is very easy for these devices to be infected with malware. Never use such devices for work, use only authorized devices issued to you by work.