Twitter hack that hit co-founder Evan Williams and Mark Zuckerberg reveals 123456 is user's most popular password

The website LeakedSource revealed 32,888,300 Twitter usernames and passwords were also on sale on the dark web, which it is believed has already led to a rash of high profile hacks, including Mark Zuckerberg and Twitter co-founder Evan Williams.

Now, it has been revealed what the most popular passwords were - with more than 120,000 users opting for '123456'.  

That was followed by '123456789,' 'qwerty,' 'password,' and a host of other easily guessable passwords (including '12345'). 

A Saudi-based group of hackers is believed to be behind the attack. 

Now it seems the Facebook founder was not their only high profile target as Evan Williams, the co-founder and former chief executive of Twitter has also been hacked by the same group.

Mr Williams' Twitter account was hacked on Wednesday, through his Foursquare account, by the hacking group OurMine. 

The group reportedly posted a tweet, which has since been removed, that read: 'Hey, it's OurMine Team, we are just testing your security, please send us a message' followed by an email address.

A Twitter spokesperson told MailOnline the social media site itself had not been hacked.

'We are confident that these usernames and credentials were not obtained by a Twitter data breach – our systems have not been breached,' they said. 

'In fact, we've been working to help keep accounts protected by checking our data against what's been shared from recent other password leaks.' 

A number of other high-profile figures have been hacked, including Lana Del Rey, Drake and Kylie Jenner - although it is not yet known if those attacks are related.

Today, the website LeakedSource revealed 32,888,300 Twitter usernames and passwords were also on sale on the dark web. 

The attacks were probably achieved by retrieving passwords stored in people's browsers, like Google Chrome or Mozilla Firefox, LeakedSource said in a blog post. 

'The explanation for this is that tens of millions of people have become infected by malware, and the malware sent every saved username and password from browsers like Chrome and Firefox back to the hackers from all websites including Twitter,' the blog said.