Indicates whether the interaction contains the first message in a new board thread or a response to an existing message in a thread.
It can take these values:
- "thread" identifies the first message
- "post" identifies subsequent messages
Filter for posts that start a thread and that mention baseball.
board.type == "thread" and board.content contains "baseball"
Filter for posts that respond to a thread and mention "Apple":
board.type == "post" and board.content contains "Apple"
Target service: Board
Always exists: Yes