The id of the primary blog associated with a user creating, updating, or deleting a post.
For likes and unlikes, use the tumblr.source.blogid target instead.
- Filter for new content in a list of blogs:
tumblr.blog.id in "123456789, 987654321, 888888888" and tumblr.activity == "CreatePost"
Target service: Tumblr
Always exists: No