You can use the following Twitter content formats as sources in Feeds.
Username: Pulls in the tweets of any public user by entering in their Twitter username. You can find the username in the URL of the Twitter page. For example, the username of https://twitter.com/finalsite is "finalsite." Enter this into the field to pull in the Tweets from Finalsite.
Hashtag: Click the "Hashtag" option when adding a new Twitter source into Feeds and type in any hashtag (you do not need to include the # symbol). This will display posts from any public users who post with that hashtag. Please keep in mind that Feeds cannot obtain historical posts for your hashtag due to restrictions of the Twitter API, but it can obtain most new posts going forward.
List: Due to changes with the Twitter API in November 2019, list sources are no longer possible.