<p>Actually the users can start talking face-to-face or use a telephone and even email to communicate</p>
As someone who grew up before the Web and social media became a thing, I can see where you're coming from, but...
As someone who has a product/service, I get a lot of value out of Facebook (and other social media) as a means of reaching out and engaging with my user community. For personal interaction, I agree that there should be more face-to-face pub-based/café-based communication but for the sort of one-to-many communication that a brand-promoter needs, FB, etc. is very very valuable.