Here is the FB page on these Social Plugins, but there is no info on how to disable them.
»
www.facebook.com/help/44 ··· 2359009/Any info I've found on the web for disabling them is old and does not apply since they've changed the FB settings menu. Seems like they also refer to this as Instant Personalization. But again all that searches turn up is old info that no longer applies.
It is looking more and more like the only way to avoid it is to log out.