Social medias

So I was watching a My Drunk Kitchen episode and I thought of something I wanted to comment, but when I went to comment I decided against it.
I don't really know why but I didn't feel comfortable leaving a comment on Youtube. I felt like there was more hate on Youtube than anywhere else, now this really isn't true but that is where my mind quickly went. I found this interesting, and was wondering if any of you guys go through this? Do you have any social media where you feel safer sharing your opinions than others? I really feel like I can express myself on Tumblr, but not so much on Twitter and definitely not on Facebook. I think it's silly but I suppose it's kind of like people, certain people you can open up to and others you can't. I feel like there is so much hate on the internet that it's hindering people's want to share their thoughts.
What are your opinions? Do you have your favorite social media site? Do you avoid sharing you internet opinion?