Norwich Union (Aviva) the insurance company have a system called The Wall iirc (been over decade).

Its a free for all for asking questions, sending messages, making unofficial FYI notes, its an attempt to document those conversations that would have otherwise taken place between individuals. Everyone from the top down has read/write access. Main objective to document those conversations, so nothing gets missed, like people being otherwise engaged in meetings/phone calls. Self Censorship takes place because everyone can view it, reduces staff harassment problems.

Management doesn't have it together, but they do make suggestions about taking on certain projects etc that are good for your career and at least talk about plans to getting to the next level (sometimes).