Online Threat Alerts (OTA) - Alerting you to scams and frauds.
Facebook - Whatsapp
If the Facebook post "You cant watch this vide0 m0re than 20 seconds" is displayed on your wall or timeline, please report it to Facebook or delete it. This post is a scam that will trick you into installing a malware, or install malicious browser extensions. The browser extensions will redirect you to other scams.
There are different versions of this scam where the scammers change the texts, images and website addresses (URL).
If you click on this malicious post, you will be taken to a website that ends with .blogspot.com that will trick you into installing a malware by claiming that Divx plugin required.
Even if these malicious Facebook posts appeared as if they were posted by trusted friends, do not click on them. It is possible those friends have unknowingly given this or other malicious applications access to their Facebook accounts.