Profiles on IPS have virtually no meta tags, at all.
This could be improved by adding a link to the users avatar and maybe a general description line like so,
$description = "Explore {$this->member->name}'s " . \number_format( $this->member->member_posts ) . " posts on " . \IPS\Settings::i()->board_name;
$newMeta = [
'title' => $this->member->name,
'description' => $description,
'og:title' => $this->member->name,
'og:description' => $description,
'twitter:description' => $description,
'og:image' => $this->member->photo,
'profile:username' => $this->member->name,
'og:url' => $this->member->url()
];
\IPS\Output::i()->metaTags = array_merge( \IPS\Output::i()->metaTags, $newMeta );
Otherwise links to profiles contain no description or anything aside the default og:image if you have one set in the settings.