Your themes do not come with inbuilt social media icons. Please consider having the options right inside the theme. However I would request you to let me know the good plugins suitable for your themes. Best
Actually, all my themes do, except Preference. Was there a particular one that you were wanting?
As for what plugins, this is really up to the end-user because everyone’s needs are different and because there are so many types of plugins, again, it depends on what the user needs. My setup tutorials for themes do go through setting up plugins based on what I am using on the live demo sites, but these are considered optional.
If you have other suggestions for themes, you may want to also consider filling out my theme’s survey to give feeback. I’m working on a new Styled Themes site but also planning new themes for the new year and the survey helps determine the direction to go with designing themes. If interested, click on the link in my signature below.