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Snapchat hack affects 4.6 million users

2 January 2014 Last updated at 21:03 GMT

The usernames and phone numbers for 4.6 million Snapchat accounts have been downloaded by hackers, who temporarily posted the data online.

The hack comes days after a security firm publicly warned of weaknesses in Snapchat's app, which it said could be exploited by hackers.

Rory Cellan Jones reports.

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