Module is worthless on PHP8.1 as it has two deprecated functions.
Deprecated function: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in Drupal\Component\Utility\Xss::filter() (line 69 of /home/sitename/public_html/core/lib/Drupal/Component/Utility/Xss.php).
Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\Component\Utility\Unicode::validateUtf8() (line 478 of /home/sitename/public_html/core/lib/Drupal/Component/Utility/Unicode.php).
2.0
Code
The issue particularly affects sites running on PHP version 8.1.0 or later.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
+1 RTBC
It works on my site with Drupal Core 9.5.3 and php 8.1.
Reviewed and tested the patch #9, works well for me as well.
LGTM, RTBC++
Committing the changes for helping the maintainer.