In the Leads and Acounts section I cannot find a way to link chatter to a Lead or Account.  All my chatter goes to a shared feed that I have to scroll through to see the Lead or Account chatter that I need.  It used to be the chatter was assoicated with the Lead or Account and then was an option to share.  I don't mind the share portion - just need to have it relate to a specific lead or account. How can I get this assoicated feature back?