My publisher site uses a domain hack (not included in the ccTLDs treated as generic). I understand that Matt Cutts and Google have made statements on foreign ccTLDs trying to target other audiences:
If you have a .jp domain and are trying to target Finland, you are really going against a lot of expectations and conventions that people have on the net. So one thing to think about would be whether it would be possible to get a generic TLD and use that for other countries.
but, having talked to friends at G, I've been told to implement hreflang tags to 'circumvent the SEO detriments' to the extent that the search console can machine learn.
At the moment, I've added:
<link rel="alternate" href="https://examp.le/" hreflang="en-us">
and of course the homepage begins with
<html lang="en-US"... but I'm wondering what else I should implement/ change? At the moment Webmaster Tools is not detecting anything. I only publish in English, so there are no alternate languages being represented. Running it through hreflang checkers, I've been instructed to also add:
<link rel="alternate" href="https://examp.le" hreflang="en" />
as a "default" language. Is