Q:

Conversion of site network into concept net

I think I have found something that will make everything intuitively easier for the users and the moderators.
There is a site called : http://conceptnet5.media.mit.edu
This is also open source, and once we have figured out how to interface the data from this site with the API, we can get a graphical representation of the concepts which becomes knowledge in this site. 
In terms of classification, if you compare 2 concept trees for similarity, it will inidicate under which Stack Exchange site the question should be. We can also use heuristics.

A:

I will quote Jeff:

If you're not willing to invest the small amount of time it takes to figure out where to ask your question -- the odds of your question being a good one are .. small.

(Source)
I second this opinion: deciding where to ask is task for the human being who is asking the question.
The system or some automated process can suggest sites, but not decide.

