Is it enough to have competing social networks to Facebook? What's the point of competition, isn't it that if one product is bad, someone can make a better one

Is it enough to have competing social networks to Facebook? What's the point of competition, isn't it that if one product is bad, someone can make a better one so that people can use that one instead? If I think Facebook is bad, can I use another product to communicate with people on Facebook? The problem is that the network is the product. If we want real competition we need to make sure that competing products can exist within the network. Look at how email works. That's the only way we can have real competition.