As far as I know:
1) I didn't see it
2) It was from the election thread in Deep Thoughts, which I do NOT mod.
Also its highly likely the FBI has bots which pick up and archive posts, so it might not have mattered even if I did delete it. They would have noticed it and contacted Null anyway. Its VERY unlikely an actual agent was reading the thread. Probably a registered account that is a bot and just scans the site for 'key' words or phrases like every other site out there.
Ages ago a guy on SA got a knocking from the Secret Service because he joked about making a threat on the President. Its unlikely the Secret Service was lurking on SA. Again, these bots are set up to comb through massive amounts of data. So if you're going to do something like this, in all likelihood it is an AI that's archiving it and brining it to the attention of the authorities. So the mods will not save you.