Companies mine big data to identify trends and set strategic direction. You have your own version of big data in your Twitter feed. You can download your Twitter archive -- that's right, everything you've tweeted and that's been retweeted on your behalf -- and you can view the tweets by month or search on keywords, hashtags or @usernames. To get your archive, go to Settings and scroll down to "Request your archive." Twitter will send you an email when the archive is ready to download.