Facebook valid code?

I’ve had some trouble integrating plugins or social apps from facebook into websites recently due to the code not being invalid.

It prompted me to check some reputable sites and check their validation and guess what… all of them failed!

Is this a new trend? are web designers less strict about validation nowadays?

from this post first I know facebook app can you tell me friends how can I know more.

Every now and then, Facebook developers always update their plug-ins and code to make more attractive and to strengthen the security of the site.

can you check them to facebook plug-ins codex if i were not mistaken.

sometimes the ID is a default FB account and not always your, I found this out with the “like” button interface.

I hope this helps