On May 25th, 2018, the General Data Protection Regulation (GDPR), a new European data protection regulation, will go into effect. You can read more about this new law and how it relates to FANDOM here.
Unfortunately, in order to comply with this regulation, we will be removing the Monobook skin from our network on May 25th as it is not possible to bring it into compliance with our updated privacy policy.
We understand that this is a drastic step and represents a significant change for those of you who are still using the Monobook skin, but we must be in compliance with this new regulation. For more information about the GDPR, please see https://www.eugdpr.org/gdpr-faqs.html
Edit: Common questions and concerns are addressed by FANDOM Staff here, here and here