If you don't want your reading activity published to your network, choose "Only Me" from the drop-down menu next to "These people or lists." Or, if you want to allow or omit certain people from viewing your activity, do so by creating custom lists.
Kristin Burnham covers consumer technology, social networking and Web 2.0 for CIO.com. Follow Kristin on Twitter @kmburnham. Follow everything from CIO.com on Twitter @CIOonline and on Facebook. Email Kristin at firstname.lastname@example.org