Twitter is awesome!!! Though, I am an advertising student and so I understand the idea behind the social marketing and its usefulness as a tool to market products, services, coupons and ideas across the internet. I use it on my phone to keep up to date on blogs, news, things of interest and yes... even friends!!!
My family recently has adopted twitter as we had a family member go through a serious and lengthy kidney transplant. My family "tweeted" my cousin's progress through the surgery and recovery time. We all couldn't physically be there but that doesn't mean we didn't care or didn't want to know what was going on!!!
Twitter is a useful marketing tool and I encourage everyone to join and use it, though I understand that I will then be using it to market to them.
PS... my cousin came through just fine! I case anyone was wondering!