What are the most common non-universal rules across all Stack Exchange sites?
19672
FAQ for Stack Exchange sites
13649
What to do with cross-site duplicates?
142259
Off-topic option should include all Stack Exchange sites
45826
How should sockpuppets be handled on Stack Exchange?
32549
List of unlinked pages on Stack Exchange sites
86270
What is Stack Exchange's workflow for handling bugs and feature requests?
126805
Don't we have single sign-on for all Stack Exchange sites?
100183
Unifying descriptions for all tags across SE sites?
295
Is cross-posting a question on multiple Stack Exchange sites permitted if the question is on-topic for each site?
111652
When is it okay to do/use something that has unspecified behaviour?
154218
What Easter eggs do we have on Stack Exchange sites?
111780
How should we deal with questions that fit on more than one Stack Exchange site?
70901
How many Stack Exchange sites are there?
84243
All internal links on Stack Exchange sites should be protocol-relative
97207
How to determine which item/role mechanic overrules another, if they contradict each other?
42553
How do I programmatically remove an existing rule that was defined in XML?
28643
Is there an error in the universal monster rules for table:natural attacks by size?