Check if this embed/video is an ok one to count.

def ok_embedded_video(node):
    """Check if this embed/video is an ok one to count."""
    good_keywords = ('youtube', 'blip.tv', 'vimeo')

    node_str = tounicode(node)
    for key in good_keywords:
        if key in node_str:
            return True

    return False