Suppose I wish to allow only users who have scored at least 15 in the particular tag to answer my question, Is it possible to set a condition like this while asking a question? So that I can avoid strangers/answers from dummy users.
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Why can't you ignore those answer if reputation is less than 15? See everyone start their reputation from 1. We can't say all people who has reputation less than 15 are strangers.
Its a nice thought. One of my best suggestion for this site is to allow only right name and right photo. Example: Raj - looks right name/hims056 looks like dummy. In case of photo, ur's dummy and hims056 used right one !!!
As @jmort253 said in his comment: a user posting an answer to your question can not prevent others (or experts) from doing so.
I strongly disagree with this as let say who has more experience who can give better useful answers and yet the have just joined SO.
In that case it would not be justice as who asked question will loose opportunity to get nice answers and will also apply to others who are seeking answer for such questions.
And also some times possible to happen like answers given by users who scored