In a world rife with messenger apps, WhatsApp is among the most successful, boasting an enormous and dedicated user base. Add to that an integrated web version that lets users take their chats to the desktop. Recently, this app was bolstered by encrypted messaging provided by the minds behind Signal. It might just be the largest secure messaging service out there. Android App
Google Opinion Rewards is appropriately named. Google sends you surveys that ask you about places you've visited recently and you get Google Play Store credit for your participation. Polls don't come in very often, but you can increase your chances of receiving more, by enabling your location and answering surveys quickly and honestly when they do arrive. It's not going to earn you a ton of store credit, but it's enough to purchase an app or an album every so often. To add some perspective, one of our editors has earned about $64 since installing the app in late 2013. Droid App
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