If I visit
I see that this candidate wants to hear about positions in "Canada, England United Kingdom".
Note there actually is a tiny village called Canada in the county of Hampshire - see http://en.wikipedia.org/wiki/Wellow,_Hampshire. However...
Stack Overflow allows spoilers in the form:
Why doesn't chat support them? They would be quite useful, especially for rooms that are frequently off topic and often have dicussions about movies etc.
Many other sites, like Arqade, would make even better use of spoilers.
Just tried testing it on my primary account and on a secondary account. My active filters were not affected. The suggested email when creating a new filter was changed both times (similar to the name that appears in the top bar on SE.com).
Or at least the interface tells me it wasn't affected; I haven't actually had a test email.