News bites: Hackers attack another BART website

Hackers leak information from another website affiliated with the San Francisco subway system.

Websites including Hulu and MSN have been tracking users' online activities with new "supercookies."

AT&T is reducing its number of text-messaging plans.

GroupOn is running low on cash.

Investors are closely watching Hewlett-Packard, which reports its quarterly earnings Thursday.

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