It looks like Mark Zuckerberg isn’t the only Silicon Valley luminary to get hacked.
Dick Costolo’s Twitter (TWTR) account was compromised on Sunday, according to Recode.
Tweets from a hacking group called OurMine reportedly appeared in the former Twitter CEO’s feed. The tweets have since been deleted, and the account OurMine has been suspended.
The account was not directly hacked. Instead, a third-party service that cross-posted to Costolo’s Twitter account was compromised, and the attackers used this old service to post to Costolo’s feed, according to Recode.
OurMine is the same group of hackers that hacked Mark Zuckerberg’s Twitter, Pinterest, and LinkedIn accounts.
The group hacks accounts to serve as a security check, to “teach” people to better secure their accounts, according screenshots of previous OurMine tweets.
Fortune has reached out to Twitter and will update the story if the company responds.