Basically everyday haha
I've even done it in class once or twice and wanted to be on the forum.
I minimized the screen really small on my comp so I could control what was on the screen better so no one behind me would get a glimpse of a big blue dildo or something as I scrolled over the ads and banners and stuff, and then once I was on the forum page I made it a little bigger so I could read and type responses with ease. Worked out well, no one caught on. But it does make me nervous so I haven't done it often.