Found a great tool for mining niches
It is 100% free, login with FB and start mining your niches
I always pref to do it manually. Other guys use "Long Tail Pro" but when you know what you are doing is much better doing it manually.
I'd use a throwaway Fb account to login just in case (I'm a little more paranoid that way :d ) other than that, looks good.
That is what i do to when i use these type of things, we have the same level of paranoia, which is a good thing online
This has nothing to do with keyword research