Tumbline is a free Tumblr theme with an elegant two-column design, which is not only retina-ready but responsive as well. This theme comes with a lot of options for easy customization of your blog. This theme also allows you to use different post icons. This theme even comes with the share button right on the homepage with sharing option over email and more than 180 social media sites. This theme even displays the like, reblog, and tags on the home page. Tumbline theme also gives you the option to showcase all your social media links using the social media icons in the footer area. Not to mention, this theme comes with a lot of color customization options.