...Not trying to troll, but rather than ask in this thread, you could simply google it, or read the first page of the Digitalpoint Twitter forum, you know. And anyway, twitter is a social media, like so many others. Answer is yes, as for all other social networks. Unless you don't want your business to be known.
Twitter is an awesome social media network. You can promote your website there by promoting your most recent blog posts. However, for Twitter to be an effective marketing tool you have to make sure that you have built a real and targeted following.
Matt said "we don't consider Twitter signals from Feb 2014", might be twitter is dead, For digital marketing and for traffic you can use it.
I believe Twitter is the best medium to promote your business as well as to maintain a pleasant relation with customers and influencers of your niche. The best way of promotion on Twitter is, running a campaign for your business.
Twitter alongside with Facebook, is the most important social media network on the internet for your business! Especially for building your audience, it's important as you can easily connect to almost everyone with a twitter account, at Facebook you will need to be friends etc. Also, everything you share, can be retweeted easily. When you're lucky you will have a viral tweet. Try using hashtags; replying to others tweeting about your subject; and using targeted following. Most important: Stay active in tweeting.
Sure, you can use twitter to promoting your business. But please dont over use so your follower will stay and interest with your tweet. From my experience, twitter will convert with very well if you have real followers and targetted with your niche so they will response with very good interactive.
Latest survey shows that there are over 300 million users of Twitter, which contains people, business and organizations. I think this lines are enough to answer your question.
Twitter is a great way to promote your business! You can tweet promotions and other business related items.
I think it can be used, twitter is a social media site, the place where a lot of people who can be interested in your site communicate, so you can tell about a new site on twitter.