How does it work?

This project uses Google Social Graph API, an API that allows to work with public XFN information from webs.

How accurate is whoistheleader.com?

This data is not real-time that can be gathered using Twitter API, instead when Google crawler indexes a Twitter web it searches for XFN data and collect it to be used with Social Graph API

Is there any chance to remove a profile?

Yes, but data is public and Google is crawling for it, so go and ask Google about it!

Any idea or sugestion of how should I improve whoistheleader.com? Do you have any rant I should care about?

Write me a couple of lines: mikel at olasagasti dot info

Do I need to login in Twitter

Short answer: NO.

Large answer: NO. Whoistheleader.com uses public data that does not need you to login in Twitter.

Does it shows all the connections?

For a normal average user all the connections gathered by Google are shown, but for big and large users only some of the connections are shown.

Is whoisistheleader.com a comercial site?

No. Whoistheleader.com is just a site created on my free time. The very little money earned from the banners is being used to pay part of the hosting at Linode. If extra money is earned it will be donated to FSFE and GNOME projects.