You are wondering if there is a way to clean up the hashtag library from SAP Jam.
SAP Jam Collaboration
Engineering team has confirmed that currently there is no option available for deleting Hashtag Suggestions. However they informed that they are working to include a feature for this in future releases.
For more information and details about hashtags in Jam, please refer to the section 5.6 Hashtags administration on page 144 in the SAP Jam Collaboration Administrator Guide
2583344 - SAP Jam - How to create a Company Feed
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