Quit hint: it's too easy to make a DOS by quickly drawing hundreds of lines in the same spot. It doesn't take more than two minutes and regular writing or drawing is too slow and ends up erased before finished.

Maybe limit the number of lines an user can draw during a certain time?

Thanks :) Yeah, we limit the length of line to try to avoid scribblers. We thought of rate-limiting the number of lines too, and adjusting the limit, so the first time you hit the limit you're stopped for 1 seconds, next time for 2 seconds, then 4, 8, 16 and so on.

Would probably work quite well.

PS is your hostname 'bd222edited for privacy.com.br' ?

Yep, that would be me. Sorry if I broke something, it started as an attempt to remove the random lines obscuring the drawings and text. When I noticed the fade out effect on the lines, I had already erased everything D:

yeah no worries, I just wanted to check that it wasn't someone trying to attack the site :)

This is more hilarous than expected

http://i.imgur.com/t9OuG.jpg http://i.imgur.com/PDqe5.jpg

yeah it's hilarious what people's doodles actually end up turning in to. Everything's logged on the server, I'm planning to do a stop-motion style playback video to put up on youtube eventually.

Would love to see that, please post on HN when you do

Really glad to see that people are interested in this!

We're actually planning to write up a little blog post about our learning experience with NodeJS etc, maybe open-source the code, and then post that to HN/reddit/etc.

We've actually been waiting for a good opportunity to 'launch' it properly. Just as a fun side-project, no real business in 300lines as it stands, though we'd like to spin off a simple collaborative whiteboard app at some point.

Thanks for the feedback :)

:D