The term "custom" comes from those Custom Groups you can make to filter who sees the post. Customs can involve two or more people in my experience and can be used any way you like (whether it's to plot in an OOC fashion or just to RP IC, just as an example).
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affictitious) wrote in ![[info]](https://www.insanejournal.com/img/community.gif){kind=small}
rp_tutorials,