CPD23 Thing 3: keeping me current once I'm out there!

I have just finished setting up my new profile on LinkedIn and it's got me thinking.  How many tools do we really need to advertise ourselves in and how many are duplicating the other?

Do people keep a mental list of all the things they're signed up to (e.g. LinkedIn, Twitter, blogs, etc.) and make sure they tick off each one whenever personal information changes?  I am a bit of an organisation freak so I would ideally like one tool that I use to store and publicise all of my professional information.  Why do I need to spread myself across all these tools?