On StackExchange sites like their genealogy site when you post a question, the software looks for similar questions, looking at both the title and the body, that have been previously asked so you can see whether there is already an answer for your question. This helps avoid people posting questions that have already been answered well before.
On G2G this is done, but only based upon the title of your question and the UI coloring hides it from attention, so usability could be improved of this feature.
I feel the feature could be improved by refreshing the suggestions based upon the body of the question when you click "Ask the Question" and to give a final review page before you post for real that offers these alternates in a visual way that is more likely to garner attention than the current presentation.