1) New Gmail account
2) Fake Facebook account
3) Fake Twitter account
4) Use these for every sign-in thing on all the stupid websites that have a boner for social media.
These accounts will never have friends. They won't have any followers to spam. "Will you allow us to post to your feed?" 'Sure. Even I will never ever see it.' I'm happily experimenting with a couple news readers now despite their asinine requirement that I sign in or otherwise attach one of the above.