Viber was just bought last Friday for $900M by Rakuten.
>"Rakuten, Inc. is a Japanese electronic commerce and Internet company based in Tokyo, Japan. Its B2B2C e-commerce platform Rakuten Ichiba is the largest e-commerce site in Japan and among the world’s largest by sales." [Wikipedia] //
What about BBM? Personally I prefer it over Viber and WA, and I'm pretty sure it has the same feature set. It also at least brags about being secure (no clue if it truly is)