How would I know if this someone is following a particular person on Twitter?

[sandy cheeks]

The question was complicated.
It's a website were you put someones twitter user name and then you put someone else's twitter user name and it will tell you if they're following each other or not.
I can't explain it, but I hope you understand the question?

[neal0on14]

How do I know who I'm following?

You clicked the 'follow' button on their profile
In place of the button on their profile, you see bold text reading 'Following' with an 'unfollow' link next to it.
They appear in your 'following' list, linked on your home timeline, just below your username.

How do I know who is following me?

Twitter sends you an email to let you know when someone new follows you, by default.
Set up your email preferences to notify you when you have a new follower.
The followers link on your profile page or home page's sidebar will also tell you how many followers you have and who they are.

How do I get followers? Can I ask someone to follow me?

There is no way to ask other users to follow you on Twitter. Though some users send an @reply to others asking them to follow, this isn't the best way to gain fans on Twitter. You should also avoid third party applications that promise to get you many followers, as these usually break our terms of service and can get your account suspended. The best way to gain friends and fans on Twitter is to engage with the service, follow others whose Tweets are meaningful to you, and be an active part of the Twitter community.
Can I restrict who follows me, or sees my updates?

Yes: protect your profile.
Protecting your profile means anyone who wants to follow you must submit a request for your approval.
Only followers you approve can see your Tweets, which will not appear in search engines.

Once I start following someone, can I stop?

Yes.

Visit the profile page of the person you want to stop following
Then, click the following button to expose the drop down box, and click "remove."

Twitter does not notify you when someone has stopped following you.
Is following like adding someone as a friend on other social networking sites?

No. Following on Twitter isn't mutual. Someone who thinks you're interesting can follow you, and you don't have to approve, or follow back.
Deciding to follow back and changing your mind later is fine- just visit the person's profile page and un-follow.
Twitter does not send a notification when you unfollow someone.
If you want to approve who follows your tweets, protect your account. The same rules apply – you can approve followers, but you don't have to follow back. If you change your mind, visit your following page and "unfollow" them.

I don't want a particular person to get my updates, but I don't want to protect my profile.

When all else fails, you can block someone from following you. But, they will still be able to see your Tweets because your profile is public.
What are "follow limits"?

Twitter has follow and update limits for site stability and abuse control.

[Joe Blogg]

I'll try to answer your question. Using the new Twitter features, you can click on the person and see the person's followers as well as those that he is following.