Math In The News - Facebook

Facebook has tons of friends - as of July 21st that number is over 500 million! 

• Twitter has 105 million users. That is _____ fewer than Facebook. Estimate the answer, then calculate. 
• LinkedIn has 70 million users. Facebook has ____ more users than LinkedIn. 
• Together, Twitter and LinkedIn have _____ fewer users than Facebook.
• Facebook has a goal of reaching 1 billion users.  How many more do they need?