The WhoKnows app can help build and maintain profiles through our expertise discovery. Even though we never publish anything about the user without them reviewing first, we do allow admins to ask users whether they want to receive these recommendations or not when a new user signs up. Here's how to turn on the opt-in for users.
Go to the Admin link in the account dropdown
Go to the Settings page and click the Who Knows What tab
Click "Let users choose to get recommended skills" to enable the opt-in.