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Millions of accounts compromised in Snapchat hack

Hackers appear to have posted account info for 4.6 million users of quickie social-sharing app Snapchat, making usernames and at least partial phone numbers available for download.

The hack was seemingly intended to urge Snapchat to tighten its security measures. The anonymous hackers said they used an exploit created by recent changes to the app, which lets users share photos or short videos that disappear after a few seconds.

Last week, Gibson Security -- a group of "white hat" hackers, meaning they don't exploit the security gaps they find -- published what they said was code that would enable such a hack. The SnapchatDB group said Snapchat implemented "very minor obstacles" after that.

"We know nothing about SnapchatDB, but it was a matter of time til something like that happened," Gibson Security wrote Wednesday on its Twitter account. "Also the exploit works still with minor fixes."

In a blog post Friday, Snapchat appeared to minimize the potential damage from such a hack, claiming that it would require a "huge set of phone numbers, like every number in an area code," to match usernames to numbers.