Hi @aveste!
Yes, you can install Nextend Social Login on multisite too. Each site will be managed separately; it will be like you have a completely separate social login plugin at every subsite, so the accounts won’t be shared between the websites.
You can also use the same application for all your subsite, just please note that each subsite has a different redirect url, so don’t forget to add each of them to your App.
For example in case of Facebook it is called “Valid OAuth redirect URIs”. If you check the 12th step of our Facebook – Getting Started tab, then you will find an URL suggestion there in each of your subsites. You should add all of those URLs to the App that you configure Nextend Social Login with.