About.me is a great site where you can combine all of your social media stuff onto one main page so people can find it easier. It's not something I really think I'll be using much, but bzzagent allowed me to sign up and try it out. It takes just a couple of minutes to sign up and set up a customized page. And if you're really busy with business and want to network a lot, I could see how it would be a big help with that.
If you sign up you can get a free pack of personalized MOO cards sent to you for just the cost of shipping. They're smaller than regular business cards and really cute. :)
*I'm a bzzagent. All opinions are my own*