Other than working on a Facebook app via my job, Facebook serves as a pretty accurate inverse metric of my productivity.

If I've been on Facebook a lot during a given week, I know that I haven't been that productive.

If I sign on, see a bunch of notifications and realize that I haven't been on in a while, I know that I've been busy, and feel good.

Unfortunately, though, it's how just about everybody I know communicates and shares their photos.