Similar to LiveJournal

Odnoklassniki

VK (service)

Mail.ru

ActivityPub

BuddyPress

GNU social

Mastodon (social network)

Misskey

Plurk

Wretch (website)

Friendster

My Opera

Perl

CERT Coding Standards

CPAN

MoarVM

Parrot virtual machine

Perl Compatible Regular Expressions

Perl Mongers

ActivePerl#PerlScript