No if there are two or more people try to modify a answer the editing tool will make you to try to make your answer fit the one that is currently being made.
They are the same thing, so neither is more popular than the other.
Many more than two questions can be merged on WikiAnswers. If the same question can be asked in dozens of ways, they all end up as alternates.
The Internet would be more powerful than WikiAnswers.
There are more than 37,000 FAQ about Relationships on WikiAnswers.
you can always ask someone you trust to find the answer on wikianswers or outside of it
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