Transfer of FB contacts to Twitter

Eureka! Eureka! I have found it...
Who says U can't #transfer ur #Facebook #contacts 2 ur #Twitter account?

Requirements:
1) Yahoo mail account
2) Gmail account
3) PC

Procedure:
1) Open ur Yahoo mail account -> Go to contacts -> Import ur Facebook contacts, by following the necessary instructions.
2) Open ur Gmail account -> Go to contacts -> Import ur Yahoo mail contacts, by following the necessary instructions.
3) Open ur Twitter account -> Go to Find Friends -> Click on "Search Contacts" next to the Gmail icon.
That's it. Your Facebook contacts, having a Twitter account, will be transferred to your Twitter account. And you will be able to Follow their accounts.

But unfortunately, out of my total 693 imported FB contacts, only 47 were having Twitter accounts!