The id of a post which is being liked or unliked.
Filter for likes and unlikes on a list of individual posts:
tumblr.dest.postid in "98765432100, 12345678900"
This is a good way to monitor the popularity individual pieces of content or collections of content.
Filter for unlikes for a specified post:
tumblr.dest.postid in "88888888888" and tumblr.activity == "unlikes"
Target service: Tumblr
Always exists: No