Researchers look for signals that might distinguish people who are upset and ranting online from those who intend to do real physical harm.
Begun as part of efforts to preserve online anonymity and privacy, Freenet, Tor and the Invisible Internet Project are, like the rest of the web, home to both crime and free expression.
Family members of Sandy Hook victims sued media personality Alex Jones over his claims that the killings were a hoax they participated in. Current law makes their lawsuit unnecessarily hard to prove.
Two websites, one taken offline, the other still active, raise hard questions about how prepared Americans are to deal with free speech about white supremacy, in both monuments and domain names.