Containment of SCP-155 is passive: the anomaly is bounded by its own hostname and does not propagate beyond https://purge.bisks.net/ under any observed condition. As a Thaumiel-class object, SCP-155 has been assessed as useful to Foundation operations and is retained in active service rather than mere containment.
SCP-155, catalogued internally as "purge," classified as a utility-class anomaly, is reachable at https://purge.bisks.net/.
The clearest surviving account of the anomaly's function is its own front-page copy, reproduced below:
mutuals you never hear from. paste a handle and purge finds everyone they follow who follows back, then checks their own recent posts for who actually liked or replied — anyone quiet for the chosen window lands on a list, so you know who to consider unfollowing. @psingletary.com asked for a tool to spot mutuals who've gone quiet.
SCP-155 entered Foundation custody after being flagged by field asset @bisks.net, whose transmission initiated standard containment procedure. First logged 2026-07-30.
Addendum 155-A: SCP-155 is one of a small number of objects the Foundation actively deploys rather than merely contains. Access is unrestricted; use is encouraged.