An article via Wired by Carl Miller, of Demos (a UK think tank), on as the sub-title says:
They are soldiers, but the 77th Brigade edit videos, record podcasts and write viral posts. Welcome to the age of information warfare
They maybe the focus, he does touch on other nation's activity (with some links) and ends with:
Disinformation and deception have been a part of warfare for thousands of years, but across the world, something new was starting to happen. Information has long been used to support combat operations, but now combat was seen to taking place primarily, sometimes exclusively, through it. From being a tool of warfare, each military began to realise that the struggle with, over and through information was what war itself actually was about. And it wasn’t confined to Russia, China or anyone else. A global informational struggle has broken out. Dozens of countries are already doing it. And these are just the campaigns that we know about.

Added for visibility here, although it may be merged later into the British military thread in another section.