TIM BERNERS-LEE (TBL) suggests a way to get started with the Semantic Web: create your own FOAF. You place data about yourself in a Friend-of-a-Friend file. FOAF files are formatted in standardised ways. You can publish information about yourself, your organisation, pubilcation, places or photos. FOAFs can point to related content that you have placed on the internet or they can point to other people you know.
TBL explains what's involved.
To create a FOAF file, you must fill out a form, such as the one at www.ldodds.com/foaf/foaf-a-matic.html. From this information, a Semantic Web–readable text file is generated that you can add to your personal website. There are semantic websites that will pull that data up and give you things like a list of photographs linking you to somebody else. I’m three photographs from Frank Sinatra because I’m photographed with Bill Clinton who’s been photographed with one of the Kennedys who’s been photographed with Frank Sinatra. That’s a silly application, but it really shows the power of the reuse of information.
Mark Frauenfelder -- "Sir Tim Berners-Lee"
Bonus Link: People Link offers more about your and your FOAF tracks than you might know.