Japanese internet powerhouse Rakuten announced that it acquired Viber for $900 million. Viber has 300 million registered users and is known for its strength in Africa, the Middle East and South East Asia. The acquisition will no doubt reignite speculation about other mid-tier messaging apps. Behind the powerhouses like WhatsApp and LINE there is a cluster of messaging apps with strong growth and more than 100 million registered users – including two hailing from the picturesque hamlet of Waterloo, Ontario. Both Kik and BBM are on their way to hitting 150 million registered users by the end of 2014. And both have intriguing regional strengths that might make them as valuable — or even more valuable — than Viber. Both Viber and BBM have been on a rampage in Africa in recent months — but BBM trumps Viber in the two key markets that make up more than 80% of Africa’ smartphone subscriber base. Read the full story at Boy Genius Report.