From relationships to revolutions: seven ways Facebook has changed the world

One in seven people worldwide used the social network on one day this week, says Mark Zuckerberg. Here is how it has changed our lives - for better or worse

On Monday, one in seven people on Earth used Facebook - 1 billion people, according to founder Mark Zuckerberg. In a decade, the social network has transformed people's relationships, privacy, their businesses, the news media, helped topple regimes and even changed the meaning of everyday words.

"A more open and connected world is a better world. It brings stronger relationships with those you love, a stronger economy with more opportunities, and a stronger society that reflects all of our values," wrote Zuckerberg in the post announcing the numbers.