Two tipsters tell us Facebook's billing systems are broken, undercharging them for spending on Facebook's Social Ads. "Ad men, like yours truly, are reporting missed charges," one tells us. Another:

Have you heard anything about the problems Facebook is having with Social Ads? Today my company was undercharged about $225 for yesterday's ad spend. That's a good way to stay unprofitable.

The advertiser wonders: "Maybe somebody should tell Sheryl Sandberg that cutting company subsidies won't help if you can't accept money. "

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