How can I share a post on my mobile from Facebook newsfeed to Whatsapp contact? Facebook post sharing works only within Facebook account?
Friendcaster for Facebook app allows for sharing Facebook posts with other apps. I haven't used Whatsapp, so I'm not sure if Friendcaster would share with that app, but I think it would.
You could also take a screen shot of the Facebook post and send that to your whatsapp contact.
You could message the link to that Facebook post to your Whatsapp contact.