I can't find it right now but I was reading a post yesterday about this. People have had 4x4's snap regularly and were recommending 4x6's or pier piling posts. Granted this was for outside hangs, and there's another post somewhere from a couple that hung their hammocks from a shelf-lookin thing that they attached to 3 or 4 studs to spread the weight. I wouldn't recommend only using a single stud for each end of the hammock though.
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