Shortly after rampaging supporters of U.S. President Donald Trump attacked the U.S. Capitol on Jan. 6, a fan of the president posted a message on the pro-Trump website Inspired by the mob's attempt to stop lawmakers from confirming President-elect Joe Biden's electoral win, user CONN_WYNN said in an all-caps message, replete with an expletive, that it was "TIME TO LEAVE THE KEYBOARD" and "FIGHT FOR MY ... COUNTRY."

Two days later, agents from the FBI's San Francisco field office came calling, according to another post by CONN_WYNN on the same website.

"PRO TIP: Think before you post. They are watching. I learned the hard way,” the user wrote on Sunday, alongside a photograph of a business card from the agents.