I love this idea for putting posts up, for lamps, that can also be fence or divider connectors. I like hiding a sturdier metal post inside a fabricated wood post, then attaching the remainder of the fencing to it. Great for high wind areas.
Simpson) makes a product called EZ-SPIKE eliminates a need for concrete post footing. EZ-SPIKE is basically a long spike that has a square top sized to accept a post that is normally used for supports. By Simpson.