You need to signup for Facebook / Twitter as well. And there are browser based feed readers. The only downside is the lack of availability of web-based feed rea

You need to signup for Facebook / Twitter as well. And there are browser based feed readers. The only downside is the lack of availability of web-based feed reader support in browsers. That might be partially on the onus of the reader, but it would require you to at least install an extension to add their site as your default feed processor. That can be a UX loss.