We’ve been working on W3C specs like Webmention, Micropub, WebSub, and Microsub to recreate some of the infrastructure offered by social media sites, but that allows website owners more control and ownership over their content–something I suspect you’re behind in using WordPress as your CMS of choice. In the very near future we’ll even have first class feed readers either on our own sites or that allow us to interact with others’ sites using our own.
If you still need to interact with sites like Twitter, Instagram, Facebook, et al. You can still do that if you like by posting to your own site and syndicating out while still allowing comments and interactions from many of these sites back to your own using backfeed via the Webmention protocol with tools like Brid.gy. Slowly over the past several years more and more CMSes are adding these bits of functionality to let peoples’ personal sites become first class social media sites that they can own and control.
I suspect that given your skills and how you’re already using your site, you could be supporting a lot of these technologies with a few simple plugins and without a lot of additional work to give you most of what you’re looking for. A group of us are happy to help if you’ve got questions about implementation.