Building your following on Twitter

Sitting idly in the passenger seat of our red minivan enroute to our Outer Banks vacation gave me extra time to investigate Twitter. Honestly, I was struggling with the rationale for this microblogging tool, or the need to post status updates so frequently. Is there a monetary value to building a large Twitter following? Is Twitter the key to becoming a leader in the world of Educational Technology? My observations lead me to believe this might be the case.