Two weeks ago I weighed in on what Twitter's new Lists function means for the PR business. Since then, I have been curating our own lists for your reference and ours. We'll continue to edit and add new lists, and will look at ways to use a one to follow more immediate issues and see how the industry is getting involved.

Connect with @PRNewser and help us find interesting and useful feeds. So far our lists are:

[Editor's note: Clicking these links while you're logged on to Twitter will display the latest Tweets from feeds included in the Lists. To follow a List, visit the @PRNewser]

Agency feeds--PR firm feeds including divisions of conglomerate agencies

Agency heads--CEOs and principals of firms

Internal PR--Including people on PR or social media teams within companies and organizations, as well as their department feeds

PR & marketing beat--Trades, blogs, and people covering PR and adjacent news

Social gurus--PR people who are deeply involved in social media for their clients or the company they work for. Yes, we expect a lot of debate.

Vendors--Newswires, database and list services, journalist-to-source matching, monitoring companies, and more

Also have a look at @Mediabistro's Lists for niche media, J-schools and profs, multimedia journalists and more.