There's a great article on the Living Proof Ministries website called Ten Truths for the Teenage Girl. One of the truths listed was that your words matter, whether they are said to someone's face, behind their back or online. James 3:9 says With the tongue we praise our Lord and Father, and with it we curse human beings, who have been made in God’s likeness. You can read the rest of the article here.
Short and sweet inspirations for Christian teen girls.