Cross-posting between SE sites and 3rd party sites
106999
Is cross-posting wrong (to an external site)?
33162
Can I switch the User-Agent header for only a single web site?
105400
What should we do about *identical* cross-site duplicates? (i.e., copy-and-paste cross-posting)
125555
How to get a cross-origin resource sharing (CORS) post request working
47803
Answering the same question across the site
69448
Posting to share knowledge instead of a strict Q&A
93242
Mixed content on many SE sites
102324
Provide a link to per-site Meta
30813
Allow cross-site queries in data explorer
13649
What to do with cross-site duplicates?
17715
Is it possible to do a cross page POST to an ASP.NET, from a static HTML form?
34507
Joining a Stack Exchange site for the single purpose of an upvote
78231
Too many SE sites causes confusion
47768
Using code posted on StackOverflow
30978
Parse question links from other SE sites
39363
Please provide the ability to cross post questions to multiple Stack Exchange communities
23667
Build and strengthen the Stack Exchange community with "crossover questions" between sites