This weekend I have been trying out some Zotabox social media buttons. I will be exploring some of their other offerings as well but so far I really like the social media buttons. While there is a bit of a delay in screen draw even with embedded code to help it along, the customization tools are a good choice. You can change the shape, orientation (vertical or horizontal), color and placement of the buttons.
They also do a great job with their quick customer assistance. This is not just available for Shopify for websites created on other platforms as well.