Found this interesting little site. 100 word stories. One hundred words, on the mark. No more, no less. It looks like they post a photo once a month as a prompt, which produce stories of variable quality.
At the same time, I've considered writing some of my own 100-word stories. Whether reading or writing, it's perfect for the minimal-attention-span creature I've become. It's harder than I thought it would be, to squeeze a story into such a short space. I managed it; the two responses I got were "Good but violent," and "Why does everything you write involve violence to women?" I thought I had killed off a lot of men, too, in my writing but maybe not. Maybe I am just prone to darkness.
Anyway, give it a shot. It's a worthy exercise.