Couldn’t find it at your links, but - here is a differeent source I found :)
Given the number of racist trolls prowling the blogosphere, the Secret Service must be legitimately concerned about which gun-wielding Republican crazies are actually a threat to the POTUS. Having software which distinguishes the more intelligent people who mock them from the dim-witted crazies themselves would certainly be useful, if it's possible. But the software would have to be smarter than most people.
The real purpose of this is so they can automate the process of finding the people that are using "social media" as a means of fomenting a possible rebellion.
I wonder what these Leftists will think when or if it's ever used against THEM?