Once you have decided to start using social media tools it can be very demotivating to discover that your desired username is already taken. You are left thinking of a perfect alternative and that is no easy task. Securing your company (personal) brand across the social web can be a huge task but it might just be worth the extra effort.
Mashable has a list of 7 services to help you find and claim your name on the web, well worth a read. While you might not be sure which social media website is the right one for you, I suggest you go ahead and claim your username before someone else does, it could just save you the extra headache of rethinking your online presence.