http://www.newsweek.com/elon-musk-twitter-followers-birthday-51-spacex-tesla-1719828

As he surpasses 100 million Twitter followers and celebrates his 51st birthday today (June 28), Elon Musk has been uncharacteristically quiet on social media.

The CEO of SpaceX and Tesla is well known for his daily presence on Twitter, often posting memes or general observations that typically garner hundreds of thousands of likes.