If you're ingesting content from a Twitter or Instagram hashtag you have the option to whitelist and blacklist specific users.
To be able to do this you will need to click on the Advanced tab while creating or editing a term.
The below screen is the what you'll see within the Twitter term and Instagram will look almost identical.
When entering a users handle in the whitelist field it will only ingest that users content and all other users content will be excluded.
Blacklist does the inverse of the whitelist and excludes all content from that user and all other users content will be ingested.