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You'll see there that one of the top "Trending" posts in the Tim Cook Karaoke trend is a Reuters article that has nothing to do w/the video
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But some clever person in Reuters social team realized name-checking the video (& the trend) in the body of the post put it into that Trend.
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Ok, pretty much confirmed that 3rd degree friendship is a valid way for entry into a Facebook Trend page. That's: a friend's friend's friend