Facebook login works like a charm.
LinkedIn creates an account, but gets stuck at profile edit screen (see attachment); I'm using RS Membership component to manage site subscriptions, and I've tried toggling "Disable Joomla Registration" but no change.
Google login returns an error: "Google not supported for this account" (see attachment).
Twitter button does not open pop-up; I've verified that the Twitter App is setup correctly.
By the way, great component!