I'm not sure what you mean by "historically", but there are many key features of London:
Big Ben
Buckingham Palace
the Thames River
London Bridge
London Eye
Trafalgar Square
Hyde Park
Westminster Abbey
the Globe Theater
Question: <em>Why can social media often be described as an echo chamber?</em>
I think that your answer is,
When people are on their cell devices and using the internet, they tend to block out things around them such as, someone telling them that on Tuesday someone will be calling them or, they have an important event coming up, and the person being told that is or was on their cell device at the time forgets what they were told. An echo chamber is when <em>someone isn't paying attention to the real world and is caught up in social media.</em>
It was named after Amerigo Vespucci an Italian explorer.
Your answer is most likely correct
