Elon Musk responded to what can be called a 'fan Valentine's Day post' from a Twitter employee shared on her ... captioning it "Happy Valentine’s Day," and tagged Elon Musk in her post.

Twitter users, it turns out, are by and large a happy bunch. Or else, people who use emoticons are. The service has revealed the 10 most used emojis of 2015 and happily there's not a sadface or ...