According to the official Polaroid Website, you should NOT shake it like a polaroid picture. In answer to the question of shaking, the site says:

The short answer is no, you don't have to (and shouldn't) "shake it like a Polaroid picture."

Shaking or waving a Polaroid picture to help the development process originated in the early days of peel-apart film. After peeling the negative, the image needed to dry before it could be handled, so waving the photo helped it to dry more quickly.

When using the integral films (600, Spectra, 500, SX-70/Time-Zero, i-Zone) that are used in our most popular current camera models (Polaroid One, OneStep, JoyCam, etc.), the image develops and dries behind a clear plastic window and never touches the air, so shaking or waving has no effect.

In fact, shaking or waving can actually damage the image. Rapid movement during development can cause portions of the film to separate prematurely, or can cause "blobs" in the picture.