Answer: Social networking Web sites
Step-by-step explanation:
Social networking web sites are online sites that provide a social platform to people for interaction, communication,exchanging messages, photos, videos, etc .Through these sites people stay in touch and establish contacts with new people .
It is also a platform where brands and advertisements can be promoted so that the users can get to know about it. It produces network of people through social media.Some social networking sites are LinkedIn,Tumblr etc.