The author's username on the service from which they generated a post.
For example, if the post is a Tweet, interaction.author.username contains the string you would find in twitter.user.screen_name or twitter.retweet.user.screen_name.
- Filter for content written by authors with "microsoft" in their username:
interaction.author.username substr "microsoft"
Target service: The Common Target: Interaction
Target object: Interaction: Author
Always exists: No