tek , 
Story of Wikipedia Admin Account Abuse
Reliable Sources: How Wikipedia Admin David Gerard Launders His Grudges Into the Public Record
A very long blog post
https://www.tracingwoodgrains.com/p/reliable-sources-how-wikipedia-admin
There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.
Accounts which solely post advertisements, or persistently post them may be terminated.
tek , Story of Wikipedia Admin Account Abuse
Reliable Sources: How Wikipedia Admin David Gerard Launders His Grudges Into the Public Record
A very long blog post
https://www.tracingwoodgrains.com/p/reliable-sources-how-wikipedia-admin