He first claimed his account had been hacked but later resigned after admitting he'd had explicit online contact with at least a half-dozen women.
In the end, the most significant impact of Weiner's woes may have been on the 2016 presidential contest.
More than any other factor, Clinton has blamed her loss on FBI Director James Comey's decision to reopen an investigation into her private email server in the campaign's final days.
But that possibility was dashed on May 19, when Weiner appeared in a New York court to face federal charges.
Weiner pleaded guilty to sending obscene material to a minor, a charge that could land him in prison for up to 10 years when he is sentenced later this month.
The girl, who showed her face publicly for the first time earlier this month, said she initially decided to come forward about Weiner because she was disturbed he had sent women photographs of him posing with his young son.