I'm still getting to grips with my Facebook business page... But I love twitter and it's a great resource for businesses, particularly the smaller ones.
It makes me smile when people I hear people say "It's full of people talking about what they're having for lunch / taking out the garbage" etc.
Yes, there are heaps of individuals talking about things that aren't even vaguely interesting.
BUT from a business perspective there are heaps of individuals sharing interesting and useful content and interacting with one another.
Interaction is definitely the key. I've picked up a number of clients purely through my use of twitter, some of whom have been people I've been "chatting" to for a while and never imagined for a minute they'd be in the market for my services.
Not only that, I've learnt things I would never have known without it (website and marketing tips for instance).
That said, it's not for everyone.
And King - you're welcome!