I use Seller Tools to tweet my Etsy products. I love the automated feature meaning I just had to set it up once and leave it to tweet automatically for me. I liked that I could choose my main product photo for my tweets and the frequency of tweets. I have noticed increased views on my Etsy shop directly from the Seller Tools auto tweets!
It's amazingly convenient for posting to my shop's Facebook page! I just set it up and then forgot about it which is awesome cause that's the whole point, to save me time and energy promoting my shop while I can direct my attention to other things!