"Visible", a very extensive and sophisticated CIA-based monitoring program is in effect watching online forums, blogs, twitters, and likely Clipmarks (where influential clips are easily tabulated). After all, it's all in the public domain, where whatever you post you must own.

In-Q-Tel says it wants Visible to keep track of foreign social media, and give spooks “early-warning detection on how issues are playing internationally,” spokesperson Donald Tighe tells Danger Room.