The connection flow is useful for the common case where the app does not yet have the access token and needs to engage the user to obtain it. But if you already have it, then you can skip all of that and go straight to constructing the API bindings for yourself.
For example, if you already have a user's access token for Facebook, you'll just need to use it when constructing a FacebookTemplate:
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Facebook facebook = new FacebookTemplate(accessToken);
Spring Social Project Lead