I use Mailchimp for my mailing list, Commento for comments and OrbitsApp for read next recommendations. Please consult those services privacy policies for more details on how they treat personal data.
If you decide to become my subscriber or leave a comment I will have access to some of your personal data like IP address or email but will never share it with 3rd parties. I use Simple Analytics for anonymized usage stats. I also use custom analytic events but they don’t contain any personal data.