3 things you need to know about today's popular messaging apps

All the action in the mobile world these days seems to be focused on messaging apps. There's good reason for that. Facebook Messenger and WhatsApp combined account for 60 billion messages a day, compared to about 20 billion daily SMS texts, according to Facebook CEO Mark Zuckerberg, who spoke at the recent F8 developers conference. That's a whole lot of smiley emojis shooting back and forth across the globe.
In case you haven't been paying attention to messaging apps lately, here are 3 things y