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> Facebook is global, the fact the suicide rate only grew in the US and not worldwide is a point in its favor.

Not necessarily. To oversimplify things to make a point, suicide may have two ingredients: Facebook and something else. The US has an increased rate because has both (Facebook and the other ingredient), while the other places don't because they only have one ingredient (Facebook) and are missing the other. It's not a point in Facebook's favor if it is one of many ingredients in a recipe for suicide, and Facebook may be the easiest ingredient to eliminate.

And that's totally plausable. The US has many unique cultural factors (e.g. highest rating of individualism of any country).