Couldn't techniques typically used for finding moles be used to test this? Astroturf a politically antagonistic group with carefully crafted information and see

Couldn't techniques typically used for finding moles be used to test this? Astroturf a politically antagonistic group with carefully crafted information and see what happens. Similar to inserting random strings into documents with each distributed copy in order to later find who leaked their copy. Either the NSA(or whomever) would have to be incredibly careful in using the information to some end, or they would abstain from using it at all. I'm not sure the benefits would outweigh the risks here.