ranksmith - 4:53 pm on Nov 1, 2012 (gmt 0)
A couple of reasons why one should use Twitter handle.
A customer support handle : Follow the customer who is not satisfied with your product and has posted an image-tarnishing review, and quickly address the issue.
An SEO ranking signal : A tweet of your link from an influential user on twitter can drive a lot of traffic, and can act as a concrete vote for SEO ranking. More the retweets of your tweet that includes your website name, better the position in search engines.