Airbnb's $850m cash injection places its value at $30bn

Airbnb has reportedly raised $850m in its latest funding round, according to Bloomberg – a move that could see it become the world's fourth most valuable tech startup. 
The cash injection places the value of the company at the $30bn mark and could help it claim a higher spot on the coveted list of so-called tech 'unicorns'; companies which are deemed to have a value of $1bn or more.
US ride hailing giant Uber, which has been valued at $68bn, is currently the most v