I would certainly use such information, though the context might change my mind. People seeing the information would certainly find it useful to know who gave you the information, Assuming you have privacy settings correct, and the information isn't the sort which could be damaging to a living person, go ahead. If you think there could be a problem, you might be able to find another person (not your source) to see if it's ok. But let such person know who would or wouldn't be able to see it.