How do I know this? Well, I "re-stumbled" across this site, Dipity.com.
What's the site about? What's the site do? Well, Dipity.com documents all social network activity that I've made it aware of and puts it on an interactive timeline.
To be honest, I forgot I signed up with it. It's neat that I did because rediscovering it has given me pretty interesting insight on what I've been doing throughout 2008 (which was pretty much nothing). What's crazy is that it has every little twitter I've made and references all of the images I've put up on flickr. I mean, a lot of internet trash. Really, it's a stalker's dream site.
Seriously, it's actually kinda cool. Here's my timeline: