G+ settings should fix this
Click the grey gear box near the top of the main page and click settings under the bold words saying "manage subscriptions" uncheck the box that says 'occasional updates from people outside my circles'.
That should take care of it.
Point of clarification: It's easiest to fix this with a full sized computer, but the changes should stick with any device.
Last edited by wcarter4; 02-13-2013 at 21:08..
Reason: Point of clarification