The most reliable way to get in contact with me is by email.
You can reach me at firstname.lastname@example.org.
Response time varies during the week and depending on what I am working on, but most easy things will get a response quickly.
I mostly deal with email during office hours in Finland (Eastern European Time/Eastern European Summer Time).
To chat, especially about my opinions from my blog, I'd recommend Mastodon, that way anyone else who is interested can join in the discussion.
I don't use LinkedIn very heavily, but it's a good way to keep up-to-date with what people are working on.
My LinkedIn profile will connect with anyone interested, but I'm keen to keep the recruiter spam out. If we work on things that may be mutually interesting, tell me in your connection request.