using facebook/twitter images and mentioning in video

Hi guys, I'm producing a couple web videos that demo iphone apps. Does anyone know the legalities behind mentioning facebook and twitter in web videos. What about showing images of facebook/twitter/yelp? The apps having sharing features that enable users to share social network pages and we'd like to show users these great features.

The videos are destined for youtube.

Any help is greatly appreciated, thank you.
 
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