They need to take some safeguarding measures.  For example, decreasing the amount of data that needs to be transmitted to users so as to decrease server loads by AJAXing the Java and GZipping the data, automatically optimizing images that are uploaded to remove useless data that would otherwise be transmitted to users with the picture, multi-homing it, and placing a connection limit to avoid DDoS attacks.
They also need to verify their backups are working properly.