Don't Use these Words ... Homeland Security Tag Words.

The Department of Homeland Security monitors your updates on social networks, including Facebook and Twitter, to uncover “Items Of Interest” (IOI), according to an internal DHS document released by the EPIC. That document happens to include a list of the baseline terms for which the DHS–or more specifically, a DHS subcontractor hired to monitor social networks–use to generate real-time IOI reports. (Although the released PDF is generally all reader-selectable text, the list of names was curiously embedded as an image of text, preventing simple indexing. We’ve fixed that below.)

To be fair, the DHS does have an internal privacy policy that attempts to strip your “PII”–Personally Identifiable Information–from the aggregated tweets and status updates, with some broad exceptions:

1) U.S. and foreign individuals in extremis situations involving potential life or death circumstances; (this is no change)
2) Senior U.S. and foreign government officials who make public statements or provide public updates;
3) U.S. and foreign government spokespersons who make public statements or provide public updates;
4) U.S. and foreign private sector officials and spokespersons who make public statements or provide public updates;
5) Names of anchors, newscasters, or on-scene reporters who are known or identified as reporters in their post or article or who use traditional and/or social media in real time to keep their audience situationally aware and informed;
6) Current and former public officials who are victims of incidents or activities related to Homeland Security; and
7) Terrorists, drug cartel leaders or other persons known to have been involved in major crimes of Homeland Security interest, (e.g., mass shooters such as those at Virginia Tech or Ft. Hood) who are killed or found dead.

http://animalnewyork.com/2012/02/the-department-of-homeland-security-is-searching-your-facebook-and-twitter-for-these-words/