Campaign: Facebook and Piwik count different? (2 replies)

We generated some Links with the URL Builder: [piwik.org]

These were used for Campaign Ads in Facebook. Now we have a difference in the Click Count.

Facebook Counts 758 Clicks on our Website-Campaign URLS in total.
Piwik has 710. Maybe this difference can be explained with different tracking mechanics.

But why is it that some specific Links have more clicks in Piwik than in Facebook?
Isn`t that impossible?

Hope you can help.

Best regards

Christoph