I had my surgery when the internet was young. There were perhaps 2 or 3 main WLS message boards not unlike bariatric-pal, along with several 'blogging' sites where a few folks detailed their experiences, generally in text.
I kept a journal form history from the moment I decided to have surgery until about 2 years post-op, which included appointments, milestones, and stuff I found interesting, then the next year was my running journal in much the same form. Though I wrote my entries in a form that was to be read, I never really intended to share them publicly, though eventually I did just that anonymously out there on the internet somewhere.
My only caution is to remind you the internet is forever. There may come a day when you'd like to allow your WLS and weight issues to fade into the past. Be sure you don't reveal too much.
Good luck,
Tek