I agree, it's definitely harder to contact people without Twitter. However, in the last year I didn't need to contact anyone (people as well as businesses) who had just an account on Twitter.

And I think redacted information on WHOIS isn't a problem, because at least in Germany (where I live) an “Impressum” (with a way to contact the website owner) is required by law.

Jan-Lukas Else
20 years old student who writes about everything he cares about.