A social networking service is an online platform that allows users to create profiles and connect with others who share interests or real-world connections. It represents each user with a profile that shows their social links and provides services like messaging. Most are web-based and let users interact through email and instant messaging. Twitter is one example that allows direct messages between users, different types of tweet content, following others, viewing trends, and authentication through profiles.

2.  A social networking service is an online service, platform, or site
that focuses on facilitating the building of social networks or
social relations among people who.
 for example, share interests, activities, backgrounds, or real-
life connections.
 A social network service consists of a representation of each
user (often a profile), his/her social links, and a variety of
additional services.
 Most social network services are web-based and provide means
for users to interact over the Internet, such as e-mail and
instant messaging.

4. Features
 Messages- called as Direct Messages.
 Tweet Content:
 Pointless Babble
 Conversational
 Pass along value
 Self Promotion
 Spam
 News
Adding and Following Contents
Trends
Authentication

7. You could
also use
twitter for
phone