flickr might mark accounts where most images are non-photographic content (and according to their definition this seems to apply for Second Life shots) as NIPSA. NIPSA means "Not in Public Site Areas". From their community guidelines:
NIPSA means your photos won't show up in photo searches, but they will still be visible in your pages, your groups and contacts.
Bear in mind at the time of writing, public photos tagged with public photos tagged with secondlife (and/or "Second Life" if you want to get picky) total 4605.
read further
Flickr Community Guidelines
SL Wiki page for the Snapshot feature
wiktionary definition of "snapshot"
Discuss, Comment etc.