Collaboration tools for communities of practice

I have never been really satisfied with various studies and white papers on collaboration tools because I believe that the tools you use to collaborate depend on the level of trust you have established between the parties involved. There is no point in blogging if you don't want to engage into conversations, and it's no use introducing instant messenging in an organization where nobody trusts each other. So I tried to summarize this is a little diagram which I have found to be helpful in my communication. Tell me your thoughts!