They can only see a reply if they are following you...But it wont show on their profile, It will show on their home page where they can see what all their followers are doing...or up to. It WILL show on your profile though...Get it?
Yes.
If the person you are writing about is following you, then they will see what you write on their timeline. If you use their name, ie @usernamehere, then what you write will appear in their @replies. Also remember that even if they aren't following you and your profile isn't private then they can easily click on your profile and see your tweets.
If you are following two people and they are sending @replies to each other then they will appear on your timeline. This is because you have chosen to follow both of their tweets.
To read Sunlova21 tweets, you can visit their Twitter profile directly by searching for "Sunlova21" on Twitter or using the URL twitter.com/Sunlova21. Once on their profile, you can scroll through their tweets, retweets, and replies. If you want to keep updated with their posts, consider following them to see new tweets in your timeline.
No. Twitter prohibits this in there TOS.
Yes they will see it in their @replies.
Yes, you can see how many people are following a Twitter account. All you have to do is go to the person's profile and look at the "Followers" amount.
People can't see who has viewed their profile/picture.
No you can't. You are only given a count of how many people have viewed it.
Yes they can see a reply if they click on their @replies. That's how you get to know peeps on Twitter!
if your profile is privatised than no but if its not privatised then yes they can
By going to your profile and clicking on "followers".