Hello everyone I have a few interesting hands that were played today. Would like to hear thoughts.

Hand 1
http://www.boomplayer.com/en/poker-hands/Boom/15979394_1D745D2694
Is river a fold everytime? Can he raise a set for value?

hand 2
http://www.boomplayer.com/en/poker-hands/Boom/15982909_1CB3371E3F
Thought this was a good spot to bluff river after the checks on the turn. Thoughts?

hand 3
http://www.boomplayer.com/en/poker-hands/Boom/15981712_171F8886E6
should i be getting it in? Though this was a good fold not sure though. Even if i was right would just like to know if I should get it in.