I use twitter (cliffball), but, all I seem to get is followers, but no hits to my website from it and I'm pretty sure it hasn't helped sales So, I'm still on the fence about it and I joined twitter over a year ago. Maybe I'm doing it wrong, I'm not totally sure.
I have been a registered user of twitter but just recently (last 1 1/2 months) I started using it much more. I have found that my web site has exploded with increased link popularity. Before using it the way I have now my link popularity was around 7,000. It is now over 30,000. The increase in popularity is validated by more than one site which measures link popularity. My search engine exposure has also dramatically increased. I know that just using twitter has not been the only reason but it is the only change in my activities that would account for this increase.
I am using twitter also @whenwelisten I have noticed traffic to my site is increasing daily. If ever so slightly, but the numbers are saying those visits are coming from twitter. I like it and do recommend you join. Look me up if you like and I will twitter back.
I am a grandparenting examiner for http://bit.ly/1BWGI and twitter has really made my page views jump, got two subscribers and it helped me climb to the #2 spot in my field of examiners for Des Moines, IA. My name on twitter is dragoneggs and yah, join it is great.
I am too. Love it. http://twitter.com/Hazeltherabbit
It is great to keep in constant contact with your friends and is a wonderful way to communicate new blogs and info on yourself.