A survey finds 18 % of social network users have blocked or defriended over political posts . Conservatives are accusing liberals of making false spam allegations to shut down debate . Comment: More than one person has threatened to show up on Stevens ' doorstep after he disagreed with them on Twitter . Netiquette expert Thomas P. Farley says people need to be aware of their audience .
A survey finds 18 % of social network users have blocked or defriended over political posts . Conservatives are accusing liberals of making false spam allegations to shut down debate . Comment: Netiquette expert Thomas P. Farley says people need to be aware of their audience .