My mortgage account works very well, and mostly because I am known in the realtor world and people just add me because they know me from previous times, such as the SEO contest last year and without any effort I have about 4,500 followers there.
But it also means you need to focus on a niche you are good with or have something to tweet about and one you are at a point where people will be interested in following you, their followers will follow.
It's not that easy with just an account where you chat about personal stuff or mix topics too much.
When I opened the account, I already learned from previous mistakes with my main one.
Yes, twitter does work, but if you fall into the trap where you add people hoping they will someone add you back and visit your site, it becomes very frustrating as the ones who dominate twitter are not likely to pay too much attention to someone they don't know.