After its first success story, Spotify responded not by rewarding consumers but by forcing new users to sign in with Facebook.
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Users who sign in with Facebook Connect will instantly see music recommendations based on both personal listening habits and the artist "likes" of a listener and their friends on Facebook.
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GetGlue's guide will use Facebook's Connect feature, which lets people sign in with their Facebook identities to websites.
News websites and apps will ask readers to sign in with their Facebook accounts so that they can send info to the social network about every article they read.
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Spotify recently announced that new users must have an account with Facebook in order to sign up at all.
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Facebook Messenger (for Android) in certain regions now allows people with no Facebook account to sign up for the service with just a name and phone number, without any Facebook account.
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Known initially as Facebook Connect, the service appears as a "login with Facebook" button on many sites and allows users to quickly sign in to those sites using their Facebook credentials.
Anyone can sign up for Facebook and interact with the people they know in a trusted environment.
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The company released a stand-alone messaging app in late 2011 and only started allowing people to sign up for a Facebook messenger account with their phone number last year.
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