That might be useful, for example, for an authoritarian regime trying to keep tabs on a journalist's movements.

"More realistically, someone could use that as an entry point into another service," Soltani said, noting that since few people bother using different passwords for different services, a password stolen from Twitter might be just as handy for reading a journalist's emails.

___

AP reporters Raphael Satter in London and Didi Tang in Beijing contributed to this report.
Copyright 2011 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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