/usr/share/click/hooks/accounts.hook is in ubuntu-system-settings-online-accounts 0.7+16.04.20160322-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | Pattern: ${home}/.local/share/online-accounts-hooks2/${id}.accounts
Exec: /usr/bin/online-accounts-hooks2
User-Level: yes
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