What is the vertical line? Why does clicking on a box not turn on/off that box? Is there some other way to turn on a box? Is there some way to generate the "[dd--dd--ddo---o---o---o]" for me, so I don't have to figure out the syntax myself and make sure I have the right length of string? Is there some way outside of twitter to try a string like "[dd--dd--ddo---o---o---o]" to see what it does, before I post it to my friends on Twitter?

I like to think I'm not the average clueless user, but this site really confuses me :) Looks like with a little polish and user testing, it could be fun, though!