After you protect your Tweets, only you and your followers can read your updates or see your Tweets in Twitter search.
What happens when my Tweets are protected but still show in search engine results? Anyone with the link will be able to view the content.
Links to media shared on Twitter are not protected. Please note that your followers may download or re-share links to media that you share in protected Tweets. If your Tweets are protected, only your followers will be able to see your media in your Tweets. What happens when I share media in a protected Tweet? Unprotecting your Tweets will cause any previously protected Tweets to be made public. What happens when I change my Tweets from protected to public? Instead, your Tweets will only be viewable and searchable on Twitter by you and your followers. If you at one time had public Tweets (before protecting your Tweets), those Tweets will no longer be public on Twitter, or appear in public Twitter search results. What happens when I change my Tweets from public to protected?