Is facebook gaming their social feeds?

I’ve noticed some peculiar behavior on facebook and I was wondering if anyone else has noticed.

When I post to my page’s wall directly, it’s built in analytics says it’s been seen by approx 250~ people.

But when I schedule it to get posted by a third party source, it gets less than half the views everytime. In fact it’s around 90ish every time.

I’d like to gather the experiences for anyone else here using social marketting to promote their brand on facebook.