As public relations professionals it is important to know the journalists we are pitching and to constantly be updated about what they might be doing, need, are talking or even thinking about. This is a great reason why you should follow journalists on Twitter! Check out this article about finding journalists who are active on Twitter.
Here are the following sites which offer the Twitter accounts in directory format of journalists:
Additional Twitter directories mentioned include the following, which aren’t limited to media contacts, but other fields as well: