People decide what's acceptable and what's not depending on what they have experienced. Some pictures are not appropriate for some group of people, but at the same time it can be meaningful, deep or amazingly beautiful to another group of audience. Life is limitless, nothing is right and nothing is wrong. What's right and wrong is based on how we (human) perceive it. Pictures you have liked or have re-blogged in Tumblr shows who you are, what you’re interested in and what society you’re in, it often also represents your feeling at the moment you re-blog. I use Tumblr to express my feelings. I also use it to look at other people's ideas. Sometimes I use it to pop up my old memories, sometimes I apply those quotes I find here with my own stories and there are times I just sit and look how the fuck they think of those jokes.