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#2 -- The character depicted and quoted is Rorschach from The Watchmen, an older comic book set that was recently adapted into a hit film of the same name. Rorschach is caught, de-masked, and sent to prison, where a doctor with a psychology degree tries to "understand" his behavior. [SPOILERS] He explains a story of how he was tracking down a little missing girl, which eventually led to the house of a deranged man who had fed the girl to his dogs. When the man laughs it off and asks to be taken to jail, Rorschach denies him the privilege, and subsequently murders him for his wrongdoings.
#3 -- Oscar Wilde, a writer who truly lived up to his surname, was alive in the late 1800s and was a man ahead of his time. This quote is definitely old, but it channels the essence of the internet community, and its anonymity. This quote is resurfacing faster than ever before thanks to the homage anonymous web-surfers are paying to it.
#4 -- There is not enough information on this quote to accurately give a synopsis of its origins, but it has been largely attributed to John Lennon and Bertrand Russell. Turns out, neither of these famous men said the quote, but instead it resides as a mystery. The quote has turned up long before the times of these people, all the way back to 1911 at the earliest.
#5 -- Henry David Thoreau, the magnificent man who is quoted in the fifth image, is another writer (don't all of the good quotes come from writers? haha!) who was around mostly in the early 1800s. He was well-known for writing about nature, and even including nature quite a bit in his stories that were about other topics. He is regarded as one of the best American writers of all time.