The workarounds are arguably a circumvention of DRM. Sites that have paywalls have chosen not to participate in social news type engagements (unless they make specific exemptions for sites like this, rendering this whole discussion unnecessary), and it seems appropriate to honor their intentions.
Is it though? They are allowing use if you have a Google refer, the "circumvention" is just linking to a Google search endpoint that redirects you to their website. You entered in the prescribed way which they made an explicit method for.
