Well-known conservative personalities were caught in the breach as well. Sam Rader, a religious YouTube user who operates a successful video blog with his wife, Nia, was found to have an account.

“She has forgiven me for this mistake that I made in opening the account,” Mr. Rader said of his wife over the weekend. “I have sought forgiveness from God and he has forgiven me, so I have been completely cleansed of this sin.”

Josh Duggar, the reality TV star who made headlines this summer for admitting that as a teenager he had molested young girls including his sisters, was found to have paid at least $986.76 to use the service, according to Gawker.

“I have been the biggest hypocrite ever,” Mr. Duggar said in a statement last week, acknowledging his activity. “Please pray for my precious wife Anna and our family during this time.”

In the news conference, the police detailed how users were targeted in an attack that began July 12, when employees of Avid Life Media arrived at work. When the employees opened their laptops, they were met with the song “Thunderstruck” by AC/DC, and an accompanying message demanding that Avid Life shutter both websites.

“This event is not an act of hacktivism, it is an act of criminality,” the company said in a statement last week. The identities of Established Men users have not been leaked. Avid Life Media is offering a $500,000 award for information leading to the arrest of the people behind the hack, the police said on Monday.

And sites advertising services to allow the public to search the leaked database or to delete profiles are loaded with malware, officials warned.