actually if you read the attachments at the end of the referenced complaint[1] the FBI is claiming he did a bit more then look up the agent and his family. He also sent various semi-threating messages to them on facebook.
Still not sure why that gives them grounds to subpoena everyone on the thread.
DOJ's insanely broad subpoena aside, this is the real lesson. If you're going to harass, even in a joking way, an FBI agent and their family, don't do it using your real name!
Still not sure why that gives them grounds to subpoena everyone on the thread.
[1] https://assets.documentcloud.org/documents/4116064/Shafer-Co...