There are three aspects of a person to consider: how others see them, how they see themselves, and how they really are.
I would first describe myself in social context, including basic personal information such as date of birth, family, race and locations of historical interest such as schools and colleges attended. A link to Facebook or a self-made biography page would suffice. Updates or a secondary site would be required if I used Facebook. It could always go the way of MySpace.
I tend to personify traits, issues, and personalities through drawing or short pieces of writing. Thus, to illustrate how I see myself, I would post images and documents of these, complete with written interpretations and explanations (if necessary.)
The last aspect is most difficult, but I would approach it by linking readers to my digital footprint. Frequented sites, screenshots, significant past user/nicknames, and posts would all be included. All favorite sites with large amounts of time logged, ranging from webcomics read or written to deviantart accounts would be included. In addition, I would include an archive of personally valued objects throughout my lifetime. Again, each would include a short description of the object along with its information and personal value.