Hey, I'm one of the authors. In fact you can delete a file. Just "view" it in the app and it gets deleted. What you can't do is delete it from the command line!

As for your "is this useful" question, I use it to send files to myself, my friends, and other computers, since it's a bit like asynchronous SCP. But of course YMMV.

Thanks for the reply, and I can see that just a few minutes ago you clarified the wording in the readme, which was my next suggestion. Definitely a cool tool, I'll definitely try it out now that I know "viewing" it deletes the file still (makes perfect sense). I figured it'd be good for temporary file storing & sending, just was a bit worried about leaving permanent copies on their servers.

When I saw it on HN frontpage, I freaked out and started adding more customization and features. :)

As we speak I'm writing the feature that will allow you to use a config file ('~/.snapchat_fs') to configure, e.g., the encryption protocol used, which would make storing features more secure for you, the user, in the event Snapchat starts snooping through stuff you've uploaded.