From Facebook Developer Wiki (FbDevWiki.com)
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Highlighted rows are indexable / searchable and one is usually required in the WHERE portion of the query.
|thread_id||string||Unique identifier of the thread.|
|type||int||Flag to indicate whether the action is a subscribe (1) or unsubscribe (2).|
|actor||object|| The user who performed the action. This field is an object with properties |
|users||array|| List of users on whom the action was performed. Each element of the list is an object with properties |
|timestamp||string||Time at which the action was performed (Unix-type timestamp with millisecond resolution).|
Select all actions for a thread
SELECT ... FROM unified_thread_action WHERE thread_id=...