For many of us, visiting Facebook,Twitter, or other online social network has become a regular part our daily activities. However, we may not have notice the significant ways that social networks have changed our lives. First of all, they have changed the way we get our news. These day, we often only read the news stories that our friends post online. Second, our relationships have changed. Now, it’s easier to keep in touch with new friends and find old friends that we haven’t seen for a long time. Third, many of us share thoughts with our online friends and find old friends that we used to keep private. For example, in an instant, we can tell all our online friends that we think we just failed an exam. Are these changes good or bad? That’s for each person to decide. But one thing is certain-as more people join social network and as new networks continue to appear, we can expect changes in the future.