hi,
i had a lot of research and now i got this in my mind.

Imagine that I want to access somebody's emails using YQL:

I get consumer key and secret from yahoo
make a three legged authorization
access to user's mails.

Now I'm going to access something private from another table from community ones like twitter.status.retweets.

The Question: Should I use the consumer key got from yahoo to authorize my user? And then YQL gives me an URL from Twitter to redirect my user to it if I do so?
Or should I get another from Twitter and use it to auth my user?

i may be wrong in this example. if i am, so tell me !
I'm new to oauth and YQL authorization.
Please discuss as needed.