I heard a lot about Twitter.  What is it?
user
Twitter is a service that enables users to send short messages (called “tweets”) to people they follow on Twitter.
assistant
Has it been around for a long time?
user
Yes. Twitter has been around since 2006.
assistant
Has it been around longer than Facebook?
user
Not quite. Twitter was first created in March 2006 and Facebook started in 2004. They are, however, both fairly new technologies.  Today, most people have heard of both of these services.
assistant
I heard a lot about Twitter.  What is it?
user
Twitter is a service that enables users to send short messages (called “tweets”) to people they follow on Twitter.
assistant
Has it been around for a long time?
user
Yes. Twitter has been around since 2006.
assistant
Has it been around longer than Facebook?
user
Yes, it has been around a lot longer than Facebook.
assistant
I heard a lot about Twitter.  What is it?