Is 300mb of data enough for the iPhone 5?

So, I can't figure out how much data usage I should get for the iPhone 5. At home I would always be connected to Wi-Fi, and when I'm out I'd just check FB, maybe Tumblr and my blog. I was going to go with At&T.
I've also read that people were going way over their limits and had no idea why, from just checking their FB their data usage skyrocketed. Has anyone else had that problem?
Is this just an AT&T problem or for all carries?

If you're a social person, get at least 2GB. If not, the smaller data plan may work.

If you get 300mb, and use Wi-Fi at home, i would recommend very minimal usage without Wi-Fi. Facebook will use a lot of data the more you open a page, refresh or send messages/comments.

For me thats more then enough. I use mostly sports apps, maps, news and stocks, etc… No video. I guess if you upload and view alot of large pics etc, or watch any video or use facetime, that stuff will use alot of data.

No thats not enough. And get sprint because they are unlimited data.

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