Although it appears to have been just a couple of hours since the account went down, speculation about the account's mysterious disappearance are already doing the rounds on Twitter.
The WikiLeaks founder Julian Assange's account has been deleted from Twitter for unknown reasons.
Then at 1.5am (AEDT), he popped up again with a tweet showing a cartoon of Santa making a Wikileaks "good or bad" list.
There's no mention of what might've happened to Assange's account on the Wikileaks account.
His last tweet was posted on December 22 and contained the quote from Assange: "A knowledgeable public, is an empowered public, is a free public".
Image screenshot wayback machine
WikiLeaks also posted a screenshot of the US Navy's since-deleted tweet which read "Julian Assange" in quotation marks.
The post was a quote from Assange himself, which read: "A knowledgeable public, is an empowered public, is a free public".
A Twitter spokesperson did not answer questions asking if the account was suspended but pointed to the company's language on how users can deactivate and reactivate their own accounts.
Assange, who has been holed up in the Ecuadorian embassy in London since 2012 to avoid extradition to avoid a rape accusation from Swedish prosecutors, has long used the social media site to communicate WikiLeaks plans. Several users said Assange deleted his account, but some thought the account was suspended by Twitter.
Julian Assange's name was trending after his Twitter account briefly disappeared Monday morning.