Do I really need to see the same link to the same article in both places? Maybe I should just use one (if I had to pick: Facebook). But really, what's with that? Why not have original content in each - and if you don't have original stuff for each one, do you really need both?
I suppose people have different followers / connections in different areas. But really, a little less redundancy would be nice. A little less redundancy would be nice. ;)