[wingerlang]

Same, no way I am letting a random app go through all my stuff for some novelty purpose.

Maybe it doesn't go through things? Maybe it isn't novelty? Who knows, the website isn't indicative of anything at all.

[Kuraj]

For what it's worth, the login pop-up served by Google or Facebook describes what kind of data will be shared with the app, so you can make a conscious decision.