So it's just scanning public info, right? What about the creation of fake personas [1]? What if these fake personas posted, commented and attempted to gain more information, or attempted to sway/entrap people?
It seems the line to be crossed from (a bit more than public) surveillance to manipulation is a very very thin line.
[1] http://www.dailykos.com/story/2013/06/23/1218189/-HBGary-Pal...