That feature will launch in the fall, Dorsey said.
Human curation might be incorporated into other Twitter products and services down the road, he said.
One analyst asked whether the changes might alienate Twitter's longtime power users. Even for those users, Dorsey said, more relevant content will be a good thing.
One change the executives did not discuss was a tool for editing tweets after they're posted. Last week, Kim Kardashian asked for such a tool so she doesn't have to delete tweets when she misspells something.
Dorsey has said it was a good idea but didn't mention it on Tuesday's call.
Sign up for CIO Asia eNewsletters.