This website, run by Cristina Vezzaro, displays 750 words stories and longer stories in two separate collections with no specific demands for genre or style.
I think this is a great opportunity for every beginner writer to show their talents and get feedback from readers.
It took about two days to get confirmation of acceptance of my story THE MOST EPIC PARTY EVER and just over a month to see it published. I also got invited to send a short bio and picture of myself, that you can find here
I strongly recommend you to send your stories to http://flashfiction.it/