Sustaining an effective engagement campaign can take a surprising amount of work. You could limit yourself to following the leads from the data you collect, but following without interacting first will get you a very low follow-back ratio. More importantly, if you follow and then forget people, they may follow back, but they’ll soon forget you. A high number of followers who don’t reply to, mention or retweet your account are of no value. True engagement is long-term and repetitive.
OAuth is becoming a very popular way to control authorized access to Web APIs and the data that they return. Although it's one of the most straightforward ways to accomplish this, it's still rather confusing to use. If your API uses OAuth, then you need to be able to describe it so that developers can quickly understand what they need to do.