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.
Late last week we reported on Yahoo's decision to shut down two of its APIs: the Term Extraction and the Contextual Web Search (our profiles of the Yahoo Term Extraction API and the Yahoo Search API). But in response to outcry from the developer community since that announcement, it looks like Yahoo will be keeping the Term Extraction alive.