We have identified a service issue that impacted the creation of lead records through the Facebook Lead Ads and LinkedIn Lead Gen features. Beginning on October 13, 2018, data sent from Facebook and LinkedIn to Marketo was not able to create lead records in Marketo. No other Marketo services were impacted. The service issue was resolved on October 16 and all Facebook and LinkedIn features are fully operational.
If you have any questions, please contact Marketo Customer Support https://support.marketo.com