A while back, we created this Venn Diagram to remind us of how Twitter relationships work:
Keep in mind that almost all Twitter content is public (with the exception of direct messages and, to some extent, locked accounts). This open environment -- that any user can tune into any other user's updates without permission -- is what makes Twitter different from other social networks.
As recruiters, there is great value in attracting a significant number of followers; we want our content to reach as many potential candidates and leads as possible.
There is also great value in following a number of carefully selected tweeters. I find that following a set of diverse, active tweeters, across many disciplines creates a dynamic learning resource. I know other recruiters, however, who only follow potential candidates within an industry or profession, eliminating much of the random content. There is no right or wrong way to determine who to follow.
Lastly, and most importantly, there is the overlap; the folks you follow who follow you back. These are your most important Twitter relationships, where the conversation can be two-way. While not everyone you follow will follow you back -- um, hellooo Ashton Kutcher -- the content you share can help you attract "desirable" followers.