Twitter is a social media platform that allows users to share and connect with others. To read old tweets, you first need to sign up for a Twitter account and then use the provided tools to extract the tweets that pertain to your account. Once you have extracted the tweets, you can use the search function to find specific tweets that pertain to your topic or interest. Additionally, you can use the retweet and favorite functions to keep track of what others are saying about your topic or interest.