I have had quite a few opportunities b/c of twitter. I will be speaking at GlueCon in Denver b/c of Twitter. I am much more deeply connected to my local tech community b/c of Twitter. And there are friends that I have a deeper relationship with b/c of Twitter.

Now, having said that, there is absolutely no reason anyone should have down voted you for answering the question.

Do you need it? No. Can it be highly beneficial? Yes.