social networking service or a social networking site is an online platform to build social networks or social relationships with people who share similar personal or career interests, activities, backgrounds and real-life connections. They help create, sustain and develop new social and professional relationships.

Some of the popular social networking platforms include

Facebook

Facebook is an American online  social networking service owned by Meta Platforms. It was founded in 2004. Initially its membership was limited to Harvard students gradually expanding to other North American universities and since 2006 to anyone over 13 years. As of 2020, Facebook claimed 2.8 billion monthly active users, and ranked seventh in global internet usage. Facebook can be accessed on devices with internet connectivity such as personal computers, tablets and smartphones.

After registering on facebook, users can create profiles with information about themselves. They can post text, photos and multimedia which can be shared with any other user who has agreed to be their "friend" or, with different privacy settings, publicly. Users can also communicate directly with each other via Facebook Messenger, join common-interest groups, and receive notifications on the activities of their Facebook friends and the pages they follow.