I think you'll find that most people here weigh weekly, or at least record it weekly.
I weigh daily - what matters most to me is my
average weight over days or weeks (since the little fluctuations are mostly caused by water weight and aren't meaningful), and having more data points just makes it that much more accurate. I log my weight on physicsdiet.com which does all the calculations for me and spits out a nice chart (I'm lazy

).