Mr. Soltani also ran a test in which Safari was configured to emulate an Apple iPhone.
WSJ: The Journal's Methodology for Testing Tracking on Apple's Safari Browser
Mr. Soltani verified those findings, and also found code being used by Gannett's PointRoll.
WSJ: Google Tracked iPhones, Bypassing Apple Browser Privacy Settings
Soltani also created a visualization of the passwords used most frequently by YouPorn users.
Mr. Soltani set up an automated system that visited the 100 sites between Feb. 11 and Feb. 14.
WSJ: The Journal's Methodology for Testing Tracking on Apple's Safari Browser
"It feels like the operation started last week and it hasn't ended, " Soltani, 28, told CNN by telephone.
The Soltani brothers tried to adapt by adding sandwiches to their assortment of pastries and chocolates two months ago.
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Customers' frugality has reached extremes in the recession, the 40-year-old Mr. Soltani says.
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In a test, Mr. Soltani found the PointRoll code present in ads on 10 of the top 100 U.S. sites.
WSJ: Google Tracked iPhones, Bypassing Apple Browser Privacy Settings
That bandaid measure to deal with the deluge of emails introduces new security risks, says privacy researcher and consultant Ashkan Soltani.
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Alan Soltani of Benham, a civil-engineering firm, reels off a list of reasons why new roads and bridges now cost so much to build.
Human-rights lawyer Abdolfattah Soltani was sentenced Sunday to 18 years in jail and a 20-year ban of practicing law, according to Iranian opposition websites and international rights groups.
In a telephone interview Friday, Soltani said that the relatively small number of users affected suggested either that attackers weren't on the network long or that they were only able to compromise a subset of the company's servers.
"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.
Ashkan Soltani, an independent privacy and security researcher, said such a move would give attackers "a toehold" in Twitter's internal network, potentially allowing them either to sniff out user information as it traveled across the company's system or break into specific areas, such as the authentication servers that process users' passwords.
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