...well, #FridayFlash as it happens.
FridayFlash, to use the words of Jon M. Strother its creator, "...is an Internet meme designed to increase your visibility as a fiction writer."
The idea is elegant in its simplicity. A writer writes (duh!) a story or 1,000 words or less, posts it to her or his web site - on a Friday - and tweets the fact, adding the hashtag #fridayflash. Once done, readers flock to the site to read, and comment. It's also a good way for the writer to find and read other flash fiction on Fridays (ohhh, three Fs, hard on one another's heels).
In addition, there is the collected Best of Friday Flash, Volume One already for sale (full disclosure, this author is happy to have an entry in this collection) and a second volume currently gathering entries.
So, for good Flash Fiction reading - try searching for the twitter #fridayflash tag. You will not be disappointed.