Debatable. Meta products (FB and IG) only show a small percentage of what friends and subscribed pages put out. It can also depend on what device is being used. For example, on my desktop Mac I see posts from people, on my MacBookPro I see different posts from those same people, and on my iOS/iPad devices I see posts from people whose work rarely shows up on the other devices.
I have long maintained that this selective display is because Meta cannot find anything in friends posts that can have spamverts hung therefore as these do not generate a click opportunity they won’t show the post(s).
I don’t know Joomla, but I once made a single-writer site with Drupal. It was a little clunky, but I could do absolutely everything I wanted to. After that it was all headaches – updating, security, maintaining, adding… just way too powerful for what I was trying to do with it, which it turns out can be as much of a problem as underpowered software.
That’s the reason why it does not make much sense to do self hosting unless a) you are an expert on this technical stuff or b) have strong opinions on the ownership of you content. Creating content is hard enough and requires its own dedication, fighting the technology is best left to the platforms themselves.
Do you have backup? Will it work if you try to recover from a disaster? Did you check last month’s published CVE vulnerabities from the software? And its plugins? And the operating system? Are your logs filling the hard disk space? Will you remember to renew and install the SSL certificate? The list is never ending.