Memes are a form of art of course, but I disagree with the rest. Memes are high volume commentaries, unique in their repetitiveness. Fine, modern and contemporary art is different in what topics it explores, in the way how is it consumed and what emotions does it trigger. Duchamp's ready made art brought a revolution into definition of art, Hirst's Shark is a great exploration of what is art and what is the role of the artist. Catellan's America was satirical and political and his Banana taped to the wall is a quite clever joke.