it depends, if you find them annoying then unfollow them. It doesn't makes sense if you continue following them without receiving good things from them.
If you want to unfollow that user click on the followers link and find that user on that page. When you find that user unfollow him/her or if you want to block that user I think you have to click on that users name and there might be a block link.
No they are not notified.
I think its #UF=Unfollow on twitter
Go to their profile and click "unfollow"
To not receive tweets from someone on your homepage, unfollow them.
The only way to delete someone who is following you is to block them.(Go to their profile and click "block")If you want to delete someone that you are following then go to their profile and click "unfollow".
To unfollow an individual or a board:Log into your Pinterest account.Go to your main page by clicking on your user name in the upper right hand corner, and click on "Boards."Click on "X Following" on the bar above your boards.Find the individual's account you want to unfollow, and click on "Unfollow."If you are only following a few of their boards (and not their entire account), you won't have the "Unfollow" option below their name. So you'll need to click "Follow", then "Unfollow."If you only want to unfollow one of their boards, click on the user's name, and you'll land on their main page. You can then click on "Unfollow" on the boards you want to stop following.
Tweetoid.
Go to the persons profile and click on the "unfollow" button. If you want to stop the person being able to view your profile then you can also click the "block" button.
You can block people from following you on Twitter from their profile page. Click on the gear icon on their profile page and select "Block or Report" from the dropdown menu. Select the reason for the block and click, "Block" to confirm.
if you're on your ipod then click on the blue following sign and then a menu should appear and one of the options should say unfollow. If on desktop then hover the mouse over blue following sign and a red unfollow sign shold appear where the blue following sign was.
Nope there still following each other:)there still good friends!