Investigators are combing the social media of Claudio Manuel Neves-Valente, the suspect in both the Brown shooting and the murder of an MIT professor, but questions about his background, what allegedly spurred the attacks and security holes at the university remain. #fox #media #breakingnews #us #usa #new #news #breaking #foxnews #crime #crimenews #crimestory #criminal #police #shooting #campus #security #brownuniversity #mit #providence #rhodeisland #massachusetts #investigation #