Google's? That's where you go to search for most things. Especially businesses. Looking for Sushi in Palo Alto? You go to Google. I also go there to find people's emails, blogs, and Twitter accounts, but they don't have that loc
Perhaps I'm stubborn, or set in my ways, or just old school. OK, I use many social media services, but for my primary online communication, it's still email for me.
I have a facebook account, and shove things into it, mostly from other services, but I can't say that I've embraced it.
Google, on the other hand, I use for email, docs, maps and IM.
Twitter is great for concise messages, and in fact, I don't even know the phone numbers of many local bloggers nad geeks, I simply Tweet at them.
Sometimes, I bemoan the fact that there are so many social media services around. So much to look at or update. In truth, although, I've joined many, my own habits have, over time, determined which I use most, and which I use so little, I've forgotten about.