is an interesting web application that will allow you to make auto-generated diagrams by simply typing in sentences. The first word becomes a block, the last word another block, and they are connected in the direction in which they are written, with the middle of your sentence alongside the arrow.
Typing in the same block name again will create a new relationship with that object.
Every diagram has its own unique URL which can be shared. Whoever you share it with can edit it, adding and removing items. This makes it possible for a group to work on the same diagram together, or you can come back later and make edits, yourself. (make sure you save the image to your computer and share just the image, if you don't want anyone editing it.)
And if you want to see something really scary...
here's my social flow, yo!
Diagrammr: Create and share diagrams by writing sentences