If we go anonymous throughout the tournament I will have to insist that all Flickr users must set their entries to private. As the majority of photomoders use Flickr and many follow each other any public images will be seen by many and the identities will quickly be known. I don't see Photobucket and Imageshack being so much of a problem as the user base here is very small, but it would still be a good idea to set images there to private too - although I don't know how to share a private image from either of those services.
With the tournament (and Secret Santa for that matter) you don't have to supply a preview image as all images for the polls will be uploaded to my own Flickr account and hosted (privately) from there, where the preview image will then be generated. So you may just send the fullsize image or just a link to it instead, which incidently is the only way to send a private Flickr image so the recipient can view it. For anyone that doesn't know how, read on...
To send a fullsize private Flickr image as BBCode just use the share button and 'Grab the HTML/BBCode' as usual but instead of the 'Medium 500px' size option choose the 'Original' size option instead. Copy and paste the entire BBCode and I'll be able to view it.
View attachment 127402
To send just the link use the 'Grab the Link' option instead and select 'Add a Guest Pass'. Copy and paste the resulting link and you're good to go.
View attachment 127404