Samsung has today announced that its cross-platform ChatON messaging service now boasts over 100 million users across Android, BlackBerry, iOS, and Windows Phone. It’s taken just two years for the service to become more popular than BBM, once one of the biggest names in instant messaging, and it continues to grow at an impressive rate.

I have a confession to make: I own a BlackBerry Z10, and I love it. I think its BlackBerry 10 operating system is terrific — it’ll be even better when it gets more apps — and I haven’t been this excited about a new platform since I got my first iPhone. Seriously.

I certainly don’t want to see BlackBerry sinking anytime soon, then.

But I can’t help but wonder whether BlackBerry might have just shot itself in the foot by announcing BlackBerry Messenger for Android and iOS.

At its BlackBerry Live event in Orlando, Florida, BlackBerry just announced that its popular BlackBerry Messenger service is going cross-platform. This summer, BBM will finally be available on Android and iOS — and it will be completely free.

Viber, the popular cross-platform messaging service for smartphones, is no longer just for smartphones. The company has today launched new desktop applications that allow you to chat with friends; send stickers, emoticons, and photos; and make calls from a Mac or PC.

Facebook has begun rolling out its free voice calling feature to Facebook Messenger users in the United Kingdom, just days after the service landed in the U.K. on the iPhone. You won’t need to update the Facebook Messenger app; the feature will be added quietly in the background.