I like this idea from Dan Gillmor, encouraging each of his students to register a domain name:
“Of course, the students and most of their parents have a presence on Facebook, LinkedIn, Twitter, Google+, Tumblr, Flickr and all sorts of other places. The value of conversation and sharing in general is enormous, and these services offer great convenience. But to cede our online presences – in a way, our very identities – to these entities strikes me as a mistake.”
Using Facebook or Twitter or LinkedIn exclusively for your content is like an artist who picks their own colors but still stays within the lines of a paint-by-numbers kit. A domain name is your own canvas. The simple act of saying “I own this” makes all the difference for the scope of what you can create.