Is it OK to post a question here and on other Social Q&A sites simultaneously?

Some questions, perhaps this one, are easy to answer with a simple Yes or No. Others profit from discussion. The answer may not be clear till lots of issues are explored and varying viewpoints are gathered for consideration.

For nuanced questions where there are numerous possible approaches, do you think it is a breach of etiquette to post them on more than one social Q&A site in order to get the most diverse possible sampling of opinions?