Have no doubt: Twitter is becoming serious business. And we're not just talking about enterprise Twitter apps like Yammer.

Splitweet is a new tool for "heavy and corporate" users of Twitter with some handy tools for businesses. The 3 key features:

1. Single box for posting to multiple Twitter accounts 2. Track brand mentions on Twitter 3. See Tweets from all the Twitter users being followed by your accounts

However, I'm led to question the unique value proposition here: multiple account tweeting was already possible with tools like Matt, and monitoring of a brand is easily done through Twitter Search.

What then, is the value add of Splitweet?