Tipping the scales at nearly 1 billion users strong, WhatsApp is one of the world’s most widely used messaging apps. Apparently that also means it’s worth an exorbitant sum of money to someone like Facebook who has just agreed to buy WhatsApp for the whopping sum of $16 billion ($4 billion cash and around $12 billion in Facebook shares). That’s a little more than the $3 billion in cash they reportedly offered to buy Snapchat.