The path to enlightenment is paved not only with self-awareness, but with self-control.
Abstaining from lying, abusive speech, meaningless chatter, and divisive words make up the concept of right speech. Lying, especially, is destructive, as it goes against one of the core principles of enlightenment—to see the world as it truly is.
Make every effort to do no harm to yourself, or to others, in your speech. Be polite, and allow your words to be soothing, to bridges rather than walls. Let your words be connected with the goal of enlightenment.
That which we communicate, and how we communicate it, reveals what is in our hearts, and negativity reveals a heart still torn by hatred and cravings—both of which are fueled by those presuppositions we should be attempting to shed.
Thanks to social media, it is easier than ever to spread suffering through our speech to a large number of people. Do your best to refrain from this. Remember the goal—the alleviation of suffering. Do not inflict upon others that which you wish to avoid, yourself.