Types of Twitter lists helpful for PR pros

Last week, all Twitter users gained access to Twitter Lists, which previously was being beta tested by select accounts. There’s been quite a bit of chatter this week about how to use them and what will emerge as best practices. See here and here for the lowdown on how to use Twitter lists and here for a case study on how media outlets are using them. 

So, let’s start cataloging ideas for helpful types of lists that PR pros can create. I’ll start: staff directories, subject experts, brand ambassadors. What say you?

(If you get stumped, visit Listorious for ideas.)