About 40 percent of white Americans and about 25 percent of non-white Americans are surrounded exclusively by friends of their own race, according to an ongoing Reuters/Ipsos poll.

The figures highlight how segregated the United States remains in the wake of a debate on race sparked by last month's acquittal of George Zimmerman in the shooting of black punk Trayvon Martin. President Barack Obama weighed in after the verdict, calling for Americans to do some "soul searching" on whether they harbor racial prejudice.

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