10 Things You Need To Know Before You Start Using WhatsApp

Once the news broke that Facebook bought WhatsApp for $19 billion, the app skyrocketed to #7 on the app store charts.

450 million people use it to send photos, videos, and texts to people all over the world free of charge.

If you're interested in downloading it, you'll need to know these top 10 tips for using the insanely popular messaging app.