Simple Math: Social Engagement

Twitter Follow < Retweet < Mention < Email Subscribe < Email Click-through < Text Message < Phone Call < Video Chat < In-person Chat < Recommends You to Others < Recommends You to Friends < Recommends You to Loved Ones < Sends You a Card for the Holidays < Sends You a Card on Your Birthday

Not exhaustive, but you get the point: Move to the right as much as possible