Facebook group scrapper

I need a bot or a service that gathers FB groups, It should enable me to search by keyword and location.
Massplanner scrapper isn't really that efficient when it comes to scrapping groups, it does a world wide search and bring non English groups too.
Any ideas ?

I do not know one,.. but how much would you willing to pay for it?
I could consider writing one if that worth it...

You can try FB Marketing GI, it has all the features which you are looking for.