Initializing the Twitter API In this tutorial, the so called STREAMING-API from Twitter is used. This API provides real-time access to Twitter, so the results are dependent from what is actually going on, right now. Before we start, we have to initialize the Twitter-API. To use the Twitter API, a consumer key and consumer secret is required. Therefore, you have to register as a developer who is creating a Twitter app. Create a Twitter account and then sign in at https://apps.twitter.com/. The account has to be verified with a phone number. This can be done on the Twitter webpage in the account settings. Fill in name, description and any valid URL with leading “http://”. It is important NOT to provide any call-back URL, because otherwise the registration from R will not function. After this, you can see a summary of your newly created app with a link to “manage keys and access tokens”. The consumer key and consumer secret that can be found there have to be copied into the following R-...
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