You may be wondering why TINT doesn’t support Facebook hashtags. This is because Facebook has not released an API for retrieving posts with hashtags for any third-party social aggregation service.
In the past, we were able to pull in hashtags from the V1.0 of the Facebook Graph API. However, that API was deprecated on April 30, 2015.
We have requested to be notified by Facebook if the situation changes. However, until Facebook releases a hashtag API, TINT will not be able to pull in any Facebook hashtags.
For additional reading on the subject, please visit these links:
Facebook is shutting down access to hashtags in its API - The Next Web (TNW)
Facebook Is Deprecating Its Hashtag Search API - We Are Social Media (WeRSM)
The Current & Future State of the Facebook Search API aka "Hashtag Search" - Walls.io News