According to Social Networking Problems and Controversies, "The shortcomings of social media suspect that Facebook friends and Twitter chatter are replacing real relationship and real conversation." Opponents also say that supporters confuse the interactivity provided by social media with actual participation in the global event, social media users run the risk of their online personas being co-opted by companies eager to harvest the information users share, and use them for marketing purposes. Others admit that social media has already changed the world and will likely remain a vital force in social interactions. They argue that people must therefore be sure not to become too dependent on social media and other technologies, otherwise they risk these new forms of communication dominating their lives. They reduce or eliminate face-to-face socializing. It's hard to say no, be rude, or not pay attention to someone when you look them in the eye. It is extremely easy and quick to unfriend or unfollow someone, or simply block their efforts to connect. Just one click of the mouse and your problems are over. Unfortunately, this aspect of online socializing deprives people of the opportunity to study how to resolve disputes in the world outside the Internet and may delay or disable their social skills.