So i did some research and I don't think you can natively.... because the Snapshot is local. So you need to upload it to some server and have the server send back a url that then is tweeted out.....
Plugin that I found that might help. http://c2rexplugins.weebly.com/rex_pars ... pload.html I havent tested it. but looks like it might work.... I will keep a lookout for anything that could help