WhatsApp guys? Don’t want to say “I told you so,” but as we clued you in on a few weeks ago, 2015 is said to be the year of the chat. This prediction is bolstered by the news that messaging service WhatsApp has hit 700 million active mobile users, sending over 30 billion messages daily. It's one of the biggest of the new wave of mobile message apps, with Line trailing close behind, and is becoming increasingly popular with Millennial users. Keep your eye out for these major platforms not only being useful to individual users, but to brands too. (USA TODAY)