As  you want an ontolgoy of the note itself, maybe the author should not be shown to not influence the choice?

That said, I wish there was a way to interact with the notes discovered this way. Please add a link to social clients. Something like njump but remember my choice. So add a link "join conversation" that opens a modal showing options like njump and a checkbox to remember choice. Next time, open the conversation directly in the preferred client.

Also, if you let me brows my timeline like this, I might be more inclined to label than if there is no way of jumping into the conversations.