We should physically tell people to come lurk. Get people into a culture of visiting daily, learning. This was a successful tactic employed by the chan sites and it worked, "lurk more" turned into people learning site culture and adhering to it.

Obviously for them it worked in getting people to adhere to nonsense ideas and behave in awful ways. But the same principle can be put to use for good instead. Personally I'd like to see something like a "7day liberal challenge", where we challenge liberals to visit the site 7 days in a row consistently to "test their views" and surely, if their views are solid they will not waiver. For most people I think they'll shift significantly on a lot of things through this, and many might become active users.