It all depends.
Have you noticed that in your Twitter news feeds, not all the posts there are from the people you are following or are following you. Some of those post are from people and brands/companies you might have not even taught existed.
If that is the case, how does Twitter know just the right post from people you have not followed to show to you? Or are those posts random?
Far from it, those posts are not random. In fact Twitter implies that those posts are shown to you because they feel you might be interested in them.
Invariably they are saying that they know what you are interested in.
How to Check your Interests in Twitter.
If you will like to know the list of things that Twitter thinks you are interested in, then follow the steps below:
STEP 1: Log into your Twitter account and then visit your Info page.
If you are on mobile, you will have to tap on Settings and privacy from the navigation drawer, then tap on Account.
STEP 2: Click on Your Twitter Data from the left sidebar menu.
On mobile, from the Account page, scroll down and tap on Your Twitter Data.
STEP 3: On desktop, scroll down to Interests and ads data section and then click on Inferred interests from Twitter.
On mobile, tap on Interests and ads data then Inferred interest from Twitter.
You can simply click >>> HERE <<< then type in your password in the next page to login.
From the Inferred interests from Twitter page, you will see all the topics that Twitter thinks you are interested in.
You will also notice that there is a check box next to each topic. This is so that if you see a topic that is incorrect, then you can uncheck it (telling Twitter that they are wrong and that the topic is not of interest to you).
As of now though, you cannot add new topics to the list, you can only unlike a topic in the list that is not of your interest.