Yes you can, the table is jiveexternalidentity and its in the system DB.
Here is the query I use:
WHEN identityvalue like '%google%' THEN 'Google'
WHEN identityvalue like '%yahoo%' THEN 'Yahoo'
WHEN identityvalue ~ '^[0-9]' THEN 'Facebook'
END as "Site"
order by identityvalue desc
More Like This