There's an existing Twitter account with 500,000 followers.
How do I download a complete list of followers for a Twitter account of that size?
How to Download a Complete List of Twitter Followers
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Best Answer
You can use the Twitter REST API to get all the followers.
First you need the followers/ids method:
https://dev.twitter.com/docs/api/1/get/followers/ids
With that method you can get all the ID's (beware you can only get 5000 ID's at a time).
If needed you can get more info for the follower(s) with the users/lookup method:
https://dev.twitter.com/docs/api/1/get/users/lookup