With an estimated 175 million Twitter users, it's no wonder it's so hard to track down old tweets-yours or anyone else's. Twitter stores them forever, but because of capacity limitations, its search engine takes you back just a week or two. Your only other option is to manually scroll through the individual tweets on a page, which is inefficient and does you no good beyond the 3,200-tweet limit. If you need to search back further, start with TweetScan (tweetscan.com), which keeps an index to 2007; though incomplete, it's often the best bet. If that doesn't work, you may still be able to retrieve what you need using a search engine. Try Googling with a query like this: twitter.com/ username keyword (swap in the username of the person who tweeted and a keyword from the tweet).
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