Is this even possible?

I just posted two pics to flickr. One is of Mao Zedong's gigantic picture above the Tiananmen. A minute later I can't load flickr. Nothing comes up in my browser. Through proxify.com, however, my pictures load in a second. Usually this means one thing: China is blocking me somehow from getting through. Is this kind of thing possible? I know in the past a search for "Falun gong" on Google made Google go away for exactly one minute. If this is the case with flickr too, then it is the most idiotic thing I have ever seen in China, and that, believe me, means something. Oh, did I tell you I went to a Roger Waters concert in Shanghai. I don't know who I mean with "you".