In reply to Chris Aldrich.

Thanks! I guess maybe I have few things mixed or I don't understand something.
I have look for @danicotillas@comunicacionabierta.net on Mastodon but I can't find it. I have ActivityPub activate for sure.
For the WebMention I see now my mistake but I feel that the way it's explained it's not very clear (or maybe my english).

Now the thing is, how do you make it to get your very same post on Wordpress to be replicate on Mastodon and Twitter and then get the answers from there to be shown here?
I mean, what are the exact plugins you have active just for that? Is there any need to code something inside any php file?

Thanks for your help!
As soon as I understand everything right I might be doing some user manuals in Spanish as well.