From the lj_dev journal
"Nudge, not a lot to say about it I don't think; seems you either love it or hate it. We now, has been pushed live, do not allow nudging someone who has updated within the past week. We also don't allow nudging except between mutual friends, so there shouldn't be a problem of random nudging. While I understand it further overloads the friends concept we've built, we feel it is better than adding yet another option. Jesse has committed the ability to disable nudge on your account this afternoon, though I am unsure when it will be put live."
"Nudge, not a lot to say about it I don't think; seems you either love it or hate it. We now, has been pushed live, do not allow nudging someone who has updated within the past week. We also don't allow nudging except between mutual friends, so there shouldn't be a problem of random nudging. While I understand it further overloads the friends concept we've built, we feel it is better than adding yet another option. Jesse has committed the ability to disable nudge on your account this afternoon, though I am unsure when it will be put live."