Question about twitter?

[Karen]

Protected Tweets may only be visible to previously approved Twitter followers.

When you protect your Tweets, the following restrictions are applicable:
People will have to request to follow you; each follow request will need approval.
Your Tweets will only be visible to users you've approved.
Other users will not be able to retweet your Tweets.
Protected Tweets will not appear in Twitter search or Google search.
@replies you send to people who aren't following you will not be seen by those users (because you have not given them permission to see your Tweets).
You cannot share permanent links to your Tweets with anyone other than your approved followers.

Below are the source links refer them for further details.