finding_dopplegangers.rb

def dopplegangers()
	raise StandardError.new("insufficient interests") unless interests.size >= MINIMUM_INTERESTS
	usr_ints = interests.collect { |c| c.facebook_id }		
	matches = User.collection.find({
		:facebook_id => {"$ne" => facebook_id}, #don't use current user
		:access_token => {"$ne" => nil}, # access_token = activeuser
		"interests.facebook_id" => {"$in" => usr_ints}}, # load all where at least 1 interest shared
		{:fields => [:facebook_id, :interests]}).to_a		
	matches.each {|match| match[:score] = calculate_score(match) }
	matches.sort{|x,y| y[:score] <=> x[:score]}
end
# Similarity Score Math (for now)
# num_shared_interests / (num_interests_for_user_1 + num_interests_for_user_2)