They probably have their twitter account linked with their Facebook. So anything they tweet will be there Facebook status as well.
I don't think they have Twitter accounts, as there is no indication that the post is associated with twitter.
Some of my "friends" do have Twitter accounts and their posts have the blue bird symbol.
I think they are just trying to be fashionable, but are in fact they are not.
I was just wondering, but it seems they are being dicks.
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