Bibliografía

https://norfipc.com/internet/redes-sociales-mas-populares-exitosas-internet.html

https://www.google.com.co/search?q=imagenes+de+redes+sociales&es_sm=93&tbm=isch&tbo=u&source=univ&sa=X&ei=DdLzU72oFPTJsQSTgoHIDg&ved=0CBsQsAQ&biw=1280&bih=880