anything that could get your message,products or services to your potential prospects are good medium and twitter is a good medium
If you know how to use the Twitter applications then it will be really crucial for the best possible optimization of your website. It is just the best techniques required smart ways for using these. Because social media marketing now a days a part of optimization process of the website.
Saying it is "good" or "bad" is rather abstract. Twitter is what you make it. First and foremost, you need to identify your goals. What would make Twitter worth your while? Using Twitter for the sake of using Twitter may leave you confused. Also, if your plan is to jump on Twitter to earn loads of cash... probably not going to happen - Twitter itself isn't even making much revenue! Twitter can be good for anybody, but you have to start with success and work back from there.
Well for this twitter has two sided advantages and dis-advantages. One it servers as a news section for your website's or just posting whats new. And the bad side is that its hard to use, nothing much to do exept writing status's and stuff. No applications or games to play aswell. So its boring to be on full time.