p0sixninja may be sending a message to tell people that SHAtter is a tethered jailbreak (i.e. you will be required to connect your iOS device to your computer on every reboot).
Someone asked him if SHAtter would jailbreak his girlfriend, p0sixninja answered the following:
yea but you gotta plug her everytime you wanna do itAccording to the well-known iPhone hacker Vincet, they are working on doing making the jailbreak untethered but they will not success. Of course, we will keep you informed about any updates. [viaTwitter]