What is the relationship between culture and social media?

What is the relationship between culture and social media? Apparently none. But, how do we know what other cultures around the world are like?

Of course, we can not forget books and encyclopedias. Thanks to them we have learned history and we can know what has happened centuries ago. Although we continue to use them, it is faster to consult Google when we have a question.

Social media have had a great impact on cultural diffusion, allowing access to information from any country. Millions of users exchange content thanks to the internet creating a great community. Almost everyone has a smartphone with applications that use every day. We talk with our family members by WhatsApp, we look for jobs on the net, we buy online... Why not educate ourselves through social media?