Is 1GB of data enough for iPhone 5S?

I have the iPhone 5S with 1GB of data on T-Mobile's simple plan. I was just wondering if 1GB is enough for Facebook messaging, snapchat, iMessage, Twitter, tumblr. No YouTube or downloading apps/music. Just basic social networking and a little bit of safari web browsing. Is this enough or should I upgrade to 3GB?

You should be fine, my sister has similar usage and usually only hits around 500-700Mb

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