i'm aware that plurk is a social media platform that is often used by rpers to stay in touch with each other and that it is common for them to add gamemates on sight

since when? because that hasn't been the norm in any of the games i've played in unless the person posted their plurk in their ooc intro and invited people to add them. it's not common for people to just go through the player contact list and randomly add people without invitation or asking first.