GiffGaff 'Unlimited Internet'?

So I'm going to get an iPhone and I was going to get a giff gaff deal, I know the phone has to be unlocked and what not for the sim to work but what do they mean by the term unlimited Internet? Because I'm on Facebook, twitter, Instagram and Tumblr all the time would that be okay?

No Problem… Internet is unlimited means however members can use up to 1GB of internet data per hour, or up to 3GB per day.

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