Instagram's changes came as part of its acquisition by Facebook, and the change-policy-face-backlash-then-apologize dance step is a classic Zuckerberg move.

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Then, in an instant, the port-side packer throws the hooked end of the rope over the mule's starboard side, his partner catches it, turns it round, and a 16-step dance begins.

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Syria, it seems, will let nothing interrupt this elaborate two-step, not even a Lebanese war-dance.

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But their example most plainly shows that sociability isn't a one-step but a do-si-do: a continually reciprocal dance of body chemistry and interaction.

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But scrum-half Simpson reacted sharpest to deny the Welsh star, smothering him and rolling him onto his back with the sort of two-step rarely seen on any dance floor.

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The fourth film in the "Step Up" dance franchise, the 3-D "Revolution" appealed primarily to females, who made up 64% of the audience, and those under the age of 34, who made up 83% of the audience.

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