For some social media affects their self esteem. Knowing what friends are doing, where they are going, what they are seeing is a bit voyeuristic (but with their permission). You may end up comparing yourself to them and feeling inadequate. If you are not doing something as great or exciting you may feel worthless. Your self esteem becomes dented. In some cases, to counteract this, you may then make stories up and, if not careful, get trapped in a web of lies