Questions about Twitter API

I’ve just been using the Twitter API to put Tweets on a site for the first time. Back in the day, anyone could read tweets in but then they locked it down with their new API (I say “new” but it’s been out a while now).

I have two questions:

  1. What is the point of the new API as you can still read anyone’s non-protected tweets? Is it just so they can lock accounts that make too many requests, etc?

  2. When you create an app so you can use the API with PHP, etc you need four pieces of information: Access Token, Access Token Secret, Consumer Key and Consumer Secret. Why those four? Wouldn’t just a single API key do the job?

Thanks.

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