As you have probably heard, Facebook has launched an instant messaging app. Google+ has plans for one too, as does Apple.
The battle for mobile users is intensifying, as the leading social networks try to capture and engage users across a range of mobile platforms. They want to make their networks the de facto network for the web.
The communications landscape is fragmenting rapidly. So far, when it comes to apps, most people have focused on the iPhone. But apps are now being promoted more aggressively on Android devices.
The revolution gathers pace. Traditional hiearchical management of media communications has to change, and companies and policy makers generally are going to have to re-think their communications models to remain relevant to all the conversations going on across multiple platforms.
The BBC has a good summary of the new development.