Twitter is awesome! It's so easy to use Twitter to connect with people you usually can't connect with because you have no way of reaching them. I use twitter a lot to find clients, support (e.g. I need someone from Google or Microsoft to help me with an issue), and much more. It's also a great way for me to gather news and updates. I follow the account of most of the tech I work with so I'm always up-to-date with the…
It's easier than looking up a phone number, because you don't need to search through piles of "contact us" pages. It's also lighter and less cumbersome than email.
I just wish it was easier to send private messages. Often I don't want my customer support communications to be massively public.