Twitter offline Twitter was shut down for hours Thursday morning by what it described as an “ongoing” denial-of-service attack, silencing millions of Tweeters. — Wired

ESPN censors staff The New York Times reported that ESPN issued 12 social networking guidelines to its employees Tuesday. Now, on-air talent, writers, and reporters are not allowed to have a sports-related Web site or blog. In addition, they’ll need approval from a supervisor to even talk about sports on any social networking site. — Switched

Facebook and MySpace: not so hot right now Social networking websites have lost some of their “cool” factor with younger users and are on their way to becoming the preserve of the middle-aged, according to figures published by Ofcom. — Financial Times

Former diplomat blames media for Balibo deaths The Australian media bears more responsibility than the Australian government for the deaths of five journalists in Balibo in 1975, according to retired diplomat Richard Woolcott. Mr Woolcott, who was Australia’s ambassador to Indonesia at the time of the invasion of Timor, said the young reporters, employed by Channel Seven and Channel Nine, should not have been sent into such dangerous territory. — The Australian

Digital radio launch The Radio United launch – one of the biggest events in the history of Australian radio – took place this morning. Commercial and public service broadcasters in the five capital cities came together for the huge outside broadcast to promote digital radio. — Mumbrella

Kyle replacement speculation hots up A handful of powerful but relatively unknown record company executives have emerged as the most likely candidates to replace sacked Australian Idol judge Kyle Sandilands. Sources say Sony Music talent scout Jay Dee Springbett, Whispering Jack album producer Ross Fraser and former Mushroom Records executive Mark Opitz are the three top contenders for the gig. — The Sydney Morning Herald

Going behind the paywall There are a lot of ongoing battles right now, if I can call them that, over things like paywalls and copyright. These are more than kerfuffles here, folks; we’re talking about the future business model paths for some pretty large chunks of the mainstream media at this point, for better or worse. So, in an effort to pull together some of what I think would be the most important footnotes in the Summer 2009 chapter of the book someone surely must be writing at this point, here are some recent favorites… — Invisible Inkling