In i-lign 5.0, we launched Conversations. See the thinking behind conversations at Enterprise 2.0 rocks!. Every page within i-lign (excluding lists) has the orange button with the cross through it, providing the user the ability to start a conversation. This conversation appears to everyone involved with that topic, be it a project, risk, decision, strategic outcome, concept, etc. Conversations can also be started as organisation wide broadcasts.
The user who starts the conversation has the ability to