A kid in my semi hometown in arkansas said he was going to shoot up a wal-mart if we went on a hanta lockdown. He was arrested and everything. Can you really be charged fed for typing?

So if I put on a nazi blog that said something akin to um I'm going to kill all of you.. Given I don't know who they are beside username and where they are at would I be arrested? How is that different from what the 20 year old did? He was just more specific as far as I can tell.