I hate political memes. Hate them with a fiery passion. A person’s political philosophy is, or should be, too complex to fit into a few words crammed onto a photograph. If a person’s philosophy is not too complex to do so, then I would submit that they need to delay participating in civil society until they’ve learned a bit more about the world and how it works.
That said, I can think of two philosophies that fit in a meme that are valid: “Do unto others as you would have them do unto you,” and “And ye harm none, do as ye will.”
I don’t see either of those being posted on Facebook, though.