Sorry, I'm experimenting with ways to contact. In the past I had a contact form, but I suspect people typed their own e-mail incorrectly in the form. I want to avoid using external sites such as Facebook or Twitter. I also use Disqus for comments on some pages. Do you have other ideas?
A lower right corner chat widget? There's Intercom and like 20 alternatives :- )
Or a discussion forum like Discourse or Flarum or Talkyard (I'm developing, see my profile).