Open Avril Lavigne's official website, found at http://www.avrillavigne.com/us/home. The homepage not only contains links to all of Lavigne's social media sites but also current tour and album information. (Resource 1)
Join the Avril Lavigne Community. You can become a member by clicking on the "Sign-Up" button found by scrolling the mouse over the "Login" button at the top of the homepage. Once you have created an account, click on the "Community" tab found on the horizontal list of tabs on the Avril Lavigne homepage. From the Community page, you can post to forums or send direct notes to Lavigne as other fans have done. (Reference 1)
Follow Lavigne on Twitter or ask her to follow your Twitter account. Either go directly to Twitter and sign into your account or click the "Follow Avril" button at the bottom left-hand side of the Community page. Lavigne's certified Twitter account is @AvrilLavigne. (Reference 2) You can ask her to follow your Twitter feed by posting on her page.
Send messages or updates through Facebook. Log into your Facebook account and search "Avril Lavigne." Lavigne's official community page is the first result; click on the result. Click on the "Like" button at the top of the page. Once you have "liked" Lavigne, you can post fan mail to her wall. (Reference 3)
Find Avril Lavigne on MySpace to send her fan mail. Her page is located at http://www.myspace.com/avrillavigne. Sign into your MySpace account. Look to the bottom right-hand side of the page, and click on the tab labeled "Comments." Click on the empty box that reads "Post a comment..." (Reference 4). Click "Submit" and leave your fan mail on Lavigne's MySpace page.