Alastair Morgan - Brother of the murdered private investigator Daniel Morgan and part of the Justice for Daniel campaign.
News Alliance - Campaigning for media reform.
Journalists and bloggers
Ben Fenton - The hackgate watcher for the Financial Times.
Martin Brunt - Sky News Crime Correspondent, good source of breaking news about hacking arrests.
Sean O'Neill - Crime Editor of The Times, another good source of breaking news about hacking arrests.
Dan Sabbagh - Head of Guardian media and technology, watching the Leveson Inquiry very closely and a good source of information in general.
Ross Hawkins - BBC political correspondent watching Leveson.
Keir Simmons - UK Editor for ITV News and another good source of breaking news.
Guido Fawkes - Political blogger occasionally casting an eye over the phone hacking scandal and Leveson.
Political Scrapbook - Left wing political blog also with an eye on the phone hacking scandal and Leveson.
David Allen Green - AKA Jack of Kent, keeping an legal eye on the Leveson Inquiry and hacking scandal.
Nick Davies - The Guardian journalist most responsible for breaking the phone hacking scandal.
Steven Nott - Leveson Inquiry witness with lots of interesting things to say about Piers Morgan and Trinity Mirror.
A Twitter list of the above accounts can be found here.