Social networking sites like Facebook and Twitter are effectively “locking users out” by not providing accessibility. but due to the nature of their site, they’re getting away with it. Should social media sites have to comply with accessibility legislation? See article
From a comment on the linked site dated May 21, 2009 from Dennis: http://accessibletwitter.com
That’s a boon to both people using specialized software and those like me who persist in using dial-up (and thus care about total page size).