Can I call fb_actions_cron_per_user directly from my module?

Is it possible to call fb_actions_cron_per_user($obj, $values) directly from my modules' hook_cron()?
If yes, what do I pass via $obj?

Basically mymodule_cron() checks if certain data is available, and then it needs to call DFF Action to update each users profile box with that data. I thought I could use the function in the subject directly without creating a separate trigger.