That's not provided in Passport directly. I've done something similar in an app, and just use an extra bit of middleware on the login route to track session-related information, such as what provider was used. It looks something like:
app.get('/auth/facebook/callback',
passport.authenticate('facebook', { failureRedirect: '/login' }),
function(req, res, next) {
req.session.loggedInWith = 'facebook';
next();
},
function(req, res) {
// Successful authentication, redirect home.
res.redirect('/');
});