What is the 3 Sentence Ficathon?
This is an open exchange where you answer a prompt with a fic consisting of only three sentences. It's open to all fandoms and you can post and fill as many prompts as you like, as many times as you want.

What do I do first?
You can start 3SF by posting prompts! When posting a prompt please format it this way:

fandom, character(s), prompt word/sentence.

Only one prompt per comment please. So, for example,


Open ended and anthropomorphic fills are popular too, such as:

Any, Any, "I don't like sand."

or

Earth geography, sand, "I don't like humans very much, either."

• First, really, you don't have to read every prompt and fill on every page.  You can start at the last page of this and just go forward, or back a page or two.  It's fine.
  
• You can come and go as time and energy allow, you don't have to participate the whole time, and it drops off quite a bit by mid-February.
• Even after the 3SF and new prompting end, people fill prompts all year long.
• You can fill an already filled prompt and you can can leave a prompt that's already been prompted before.  People do it all the time. 

Always make sure you're looking at top-level comments only, not threaded. That helps a lot. Your screen should look like this.




But shouldn't I read everything to see if someone already prompted the same prompt I want to leave if someone already filled it? 
No.  Prompt as many times as you want, as much as you want.  It doesn't matter if someone prompted the exact same prompt.  Go ahead and prompt again!

I left a prompt and no one filled it.  Can I prompt it again?
Absolutely!

Can I spread the word?
Yes, please. I generally fail at creating banners and embed codes but if you create one and make it really idiot-proof, I might be able to post and share it.  Feel free to cross-post this entry. If you create your own banners or icons, let me know and I'll share!
Please share the 3SF with your followers, friends, and any channels and comms you are active on.  I'll post on fandom calendar, Tumblr, and Twitter, but I don't have many connections in other spaces such as Discord.

How long will it go?
The 3SF closes to new prompts on February 28, 2021. The entry stays open permanently and people post fills all year long.

Are there any rules about cross-posting?
Nope, you can post wherever you want, whenever you want. A lot of folks collected their responses together and posted them on AO3 under the 3 sentence fiction tag. 3SFs are a terrific prompt for remixes and could be helpful for Yuletide bears, too.

I thought a lot about this. It boils down to reader beware.  In my experience, this typically gets too big, moves too fast, and the stories are too short for content warnings and ratings to even apply. It is too big for me to moderate in this way. You should assume spoilers are fair game and that the initial poster and the responder have opted to use no content warnings or tags. This means AO3 content warnings for dubcon, violence, canon character death, underage, etc. COULD be present. I've found personally that I can skim and scroll by stuff that, from the prompt, I can tell isn't my favorite flavor of delicious cake. Use your best judgment and be prepared to skip over things that aren't your thing. In this format, the obligation is on you, the reader, to protect yourself from triggering content.
Some posters do include warnings and spoiler tags in subject lines or include spoiler space, but they don't have to do so.

Why is 3SF split among several posts?  That seems confusing.
It is confusing and we always lose momentum once we have to move to a second post. The reason is because at 5,000 comments to a single post, DW installs a human test CAPTCHA, which is a pain for users.  So, once this entry gets to the upper 4,000 comments, I open a new post.  If you've been waiting until things slow down to participate, when we open a second post is often a good place to join.

If I have questions, what do I do?
I'm rthstewart everywhere, here, Twitter, Tumblr, gmail and AO3.

A special thank you to conuly  .
Last year, Conuly started logging all unfilled prompts.
This year's (2021) unfilled prompts are here.
Last year's (2020) unfilled prompts are here.

Here is the 3SF 2021 Friending Meme to show of your new DW account.