A twitter like website for pic sharing.

Including:
	User System
	User Relationship System
	
	Message deleivery System
		push
	
	#For the first version, no cache involved.
	#Cache
	#	key genertor
	#	schema
	#		metadata cache
	#		list data cache
	#Cache Integration
	#	Memcache
	#	Redis
	

	DB Integration
		#Don't use MongoDB in the first version.
		#Use MySQL to implement the basic features.
		#MongoDB
		Mysql