There really should be an offcial info on the main website in all of the supported languages - how do you think, how many people do know English well enough to find this forum, or even were enough computer-literate to not destroy their system accidentally? It is just too big thing to hide under the carpet. A lot of people have their PC almost 24/24h on, with auto updates, so they got hitted. Folks even are not sure if it is safe to reboot the system...
Personally I just feel sorry for all those people who took these alarms seriously and simply trusted Avast. I've recomended your software to tens of people, as a reliable substitute of paid ones (in at least two cases this converted to a paid version in small companies). You see, people do make mistakes, but in case of an organization, when troubles come it is important to watch how a crisis is handled. Am I angry? No, just think I will have to change antivir after trusting Avastfor 4-5years, unless Avast will not be afraid to take the responsibility, and just face all these angry people... You can post an info about millions of clients, or contest in a window while updating - why not push an information about this mistake there? So EVERYONE could see it.
Guys, I do have some experience in marketing/PR, you are doing business in a senstitive area, where trust is the basic factor (even more important than in case of financial institutions), so please do not mess it up. Take the blame, takethe hit, but save the reputation.