Plurk

Plurk
A microblogging site that allows you to "showcase the events that make up your life in deliciously digestible chunks"
URL	https://www.plurk.com
Project status	Online!
Archiving status	Not saved yet
Project source	Unknown
Project tracker	Unknown
IRC channel	#archiveteam (on EFnet)
Project lead	Unknown

A microblogging site, apparently started in 2008. Funding itself with ads and premium memberships (that hide the ads and provide a few other minor benefits). A year ago (Dec 2018) banned various sexual-related material. Unclear how easy or hard it would be to archive, but probably good to keep an eye on it.