that's hardly a 37signals "thing" and makes sense in a lot of products.
if i remember correctly, livejournal moved users from livejournal.com/user to user.livejournal.com many years ago for security reasons due to some cookie issue with a certain browser. moving to subdomains allowed them to set per-host cookies.
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subdomains (mycompany.theapp.com)
that's hardly a 37signals "thing" and makes sense in a lot of products.
if i remember correctly, livejournal moved users from livejournal.com/user to user.livejournal.com many years ago for security reasons due to some cookie issue with a certain browser. moving to subdomains allowed them to set per-host cookies.