To use STG on text or social media, hold it before or after a statement to emphasize the truth or emotional emphasis. For example, "Stg, that movie shouted me" or "I didn't, stg." It is informal, so it is best used in random chats, memes, comments, or posts among friends. Avoid using it in professional or formal contexts, as it can also come across as very random or unfair depending on the context.