Original source: https://gist.github.com/kirillzubovsky/6333f09f3d557397dc6f

delete.rb

# Step 1: request and download your twitter archive
# Step 2: create a twitter app (on their dev site) so you can fill out the key and secret data
# Step 3: run, and prosper

require 'twitter'
require "json"

USERNAME = 'YOURUSERNAME'
ARCHIVE_PATH = '/YOUR/DOWNLOADS/FOLDER/data/js/tweets'

client = Twitter::REST::Client.new do |config|
  config.consumer_key = '-set-'
  config.consumer_secret = '-set-'
  config.access_token = '-set-'
  config.access_token_secret = '-set-'
end

Dir.foreach(ARCHIVE_PATH) do |item|

  unless (item == '.') or (item == '..') or (item == '.DS_Store') 
    #ignore system files and paths
    
    file = File.readlines("#{ARCHIVE_PATH}/#{item}")[1..-1].join()
    data = JSON.parse(file)

    data.each do |tweet|
      removeId = tweet['id']
      begin
        client.destroy_status(removeId)
        puts "destroyed tweet_id: #{removeId}"
      rescue => e
        puts "ooops: #{e} -- t_id: #{removeId}"
      end
    end
    
    sleep(60)

  end

end