Hi I'm Nic Soto AKA Social Marketing Mama, and co-founder of Public Relations Depot Chicago.
"The range of our services enables us to provide complete marketing solutions that meet your objectives, deadlines, budget as well as goals." - Public Relations Depot
I got banned from temporarily making any more twitter search's after trying to add everyone in this thread.
For future reference, I would stop around the end of page 5, and start again the following day if you intend to try to add everyone who has contributed.
Twitter is a microblogging site. You post short (140 character) updates about anything and can include links. It's the web equivalent of being at a huge party and you can just chat, network and share information.
There's a post on my blog about using Twitter for business (apologies for the blatent plug but this is why my blog exists) and feel free to take a look at my Twitter profile for a bit of an insight.