When creating a post, how do you tag users who are on different instances? For example, I'm creating a post on pixelfed.ca and I want to tag someone on pxlfd.ca. The tagging menu seems to only show users in the local instance. In the comments section, I have no problems mentioning users in other instances.

===Update - Apr 29, 2025===

I found a comment from dansup in issue 5885 on the Pixelfed GitHub. The inability to tag users on other instances is by design.

I guess this is more of a general Pixelfed question, but what happens when a user hits their storage limit? Pixelfed.ca has a 1 GB per user limit. Will the user be unable to upload new content or will content be automatically deleted?

I'm trying to view a post from a user on another instance and it shows "no preview available." I pasted the following URL into the search box on Pixelfed.ca.

https://pixelfed.social/p/Maipodenco/800434485245838670

I'm new to the Fediverse and I'm still trying to understand how this all works. While browsing the All/Federated home page, I saw some posts which seemed to be pornographic. It got me thinking about the rules of Lemmy instances. Lemmy.ca has a "no porn" rule. Hypothetically, if I were to use my Lemmy.ca account to post porn on an instance which allows that type of content, would I be in violation of Lemmy.ca's rules?

I guess the question is related to my confusion about where federated content is stored. If I use my Lemmy.ca account to reply to a Lemmy.ml thread, which server does my comment "live" in? If I were to delete my Lemmy.ca account, would all my comments in Lemmy.ml disappear too?