every time we join a social network, fill a profile send messages, post a comment or share a video,we create a digital footprint that is potentially public and permanent. Other can do anything with our personal data. for example, our full name,workplace, family and other details. Here are general tips to protect our personal data. First of all,use privacy controls on our favorite websites and use them if the websites let us control the information we share with our friend. Second, we should comment only with people we know offline. sometimes, someone tries to add us as a connection. if we don't really know them,.we should block them.