Create a professional blog

Produce and deliver a professional blog for our website that is going to launch this month. Build it with a tool that is preferably free and makes it easy for different contributors to publish articles. Needs to be easy to maintain. Need to integrate the twitter frame to preview the tweets from our twitter account. We can do the design here if it's more convenient for you. We need to validate the design first before taking it to HTML. The SEO should be top notch and receive visitors directly interested in our subject. (website targeting professionals only not mass market)