Facebook is making headlines with a new graph that depicts the personal relations of web users. It's sort of like a huge social search-engine. People can use "Social Graph" to find others who have the same interests, hobbies or problems -- and then talk to them.
https://p.dw.com/p/19eNE
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The graph simply tosses together all the available data that applies to the keyword that you type into it. That's caused some concern about privacy.