Some believe it could be a nod towards future plans for a presidential run, but CNN noted it could also be a coy marketing strategy for his upcoming book, due next spring.
Other recent tweets from the account show scenic pictures from different places, including Iowa.
In May, US President Donald Trump fired Comey from his post as the head of the nation's top law enforcement agency - something he only found out about from the news, catching him "flat footed", as the Los Angeles Times put it. The account, which was created way back in February of 2014, is named after the late Reinhold Niebuhr, an American theologian, ethicist and commentator on politics and public affairs.
The pseudonym was confirmed as Comey by Brookings Institution legal analyst Benjamin Wittes.
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Comey is married to Patrice Failor, who is an Iowa native.
According to the Gizmodo article, written by Ashley Feinberg, Comey let slip at an Intelligence and National Security Alliance leadership meeting that he had both secret Twitter and Instagram accounts.
Comey has tweeted six times since March 30, when he posted a link to the FBI's job website with a meme of Will Ferrell's character, Ron Burgundy, in the movie "Anchorman".
Following the Gizmodo article, Niebuhr tweeted Anchorman meme "Actually I'm not even mad, that's amazing", with a link to the Federal Bureau of Investigation jobs page, which does make us wonder about the FBI's handle on social media.
Comey has more than 40,000 followers, a number that grew throughout the day Monday.