You may try out Vero today, the app made by a billionaire because he was frustrated with the privacy policies of ad-based social networks. I recommend you consider micro.blog as well, a social network and publishing platform for independent microblogs, created by Manton Reece – plus it is designed for the open web:
Today, most writing instead goes into a small number of popular social networking sites. These sites became popular because they made it so easy to connect with friends and start publishing, and because they provided a timeline user experience that made everything easy and fast. But this simplicity comes at a cost: it’s impossible to move content between these platform silos, ads are everywhere, and if a company goes out of business, all the writing hosted there vanishes from the internet.
Oldschool blogs and their RSS ability are another social network without ads and algorithms, although the combination of writing and reading is not as fancy as Vero. Yet.