When I was a kid I kept a sort of diary of my nature observations, and also kept sketchbooks of the same. Friends of mine convinced me to scan them and put them up on the web a few years back:http://www.firescribble.net/acs/
Nowadays many people use blogs for this purpose, of course
I find it interesting that you say you "post" to your diary -- that's a term usually used for blogging but now we've come full circle and we "post" to our diaries. It reminds me back in the 80s when we'd say the computer is "down" or the photocopier is "down" -- one day one of my colleagues didn't show up for work and I asked if anyone had heard from her; one of our co-workers replied "oh, she's down today."