I use Plaxo, mainly for backing up my address book. Plaxo also lets you connect a number of online services to your Plaxo profile and share updates with connected acquaintances, providing a sort of ad hoc online social network.
And Plaxo nags you every time you go to your profile page, asking you to update your status by entering a little text into a field. There doesn't seem to be any way to turn off the status report feature, so you also don't have any way to get it to quit nagging you. But I've found the hidden setting that lets the people linked to you know that you're not using the status reports, and, more importantly, gets Plaxo to quit nagging you.
All you have to do is enter the secret text into the status report field. The secret text reads: "is not providing status reports."