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Hidden inside the latest version of the operating system. and it's not just facebook. it's not just apple. facebook is also stirring up controversy by tracking its users, though not in the same way. mary snow has more on that. >> so this is our mother's day contest. >> reporter: sharing a story about your mother may seem to not have anything to do with tracking people. >> if we can get involved in the conversation and relationship, it builds a bigger bond which, therefore, sheps sales. >> reporter: what he considers pay dirt, getting customers to share with facebook friend that he's liked the ...

Growing toll that this conflict is taking on all of people in libya. human rights watch says 300 have been recorded as killed in misrata alone. doctors say the true number is more like 1,000, while many people just bury their dead at home. with fighting beginning on such a wide area, it's nearly impossible to get an accurate death toll. >> tim hetherington's documentary had been nominated for an oscar. he once said he wanted to bring war into people's living rooms so he could get an idea of more what was like. >> reporter: he traveled the global, documenting some of the world's deadliest confl...

Known publicly on facebook, we might start serving her up ads about wedding flowers. >> reporter: that kind of information posted can be profitable for facebook and advertisers. some privacy watchdog groups are raising a red flag. jeff chester is the director of the center for digital democracy. >> what makes facebook different and one of the reasons we are concerned about it in terms of protecting privacy is facebook is not only tracking what you do on your facebook page and your profile, but it's tracking and analyzing the communications between you and your friends and acquaintances. >> rep...

wonder what's going to shake out there and one name keeps coming up. what is that name, folks? yep. trump. he is of course a world famous real estate mogul, a reality tv star. but -- you know that part, but we also know him because he has teased us in previous years. he's teased us with his presidential aspirations, toying with a run back in 1988. the same thing in 2000. this time though he says he is "very serious." being famous not necessarily hurting him at this point. brand-new poll from the pew research center shows voters in general, especially republicans, have heard more late...

enter the exclusion zone near the fukushima nuclear plan the. the power station has been leaking radioactive material since the earthquake and tsunami on march 11th. within days, the area for 20 kilometers around the clo plant was evacuated. authorities say some people have moved back in and others have been collecting possessions from their homes. now one member of each household will be allowed in for two hours to get their things. the government says the crackdown is needed for public safety. cnn's stan grant is in tokyo. we understand you were at the area within the exclusion zon...