Somewhere in a Twitter, I found a couple of links to social networks settings and advice to check the list of third-party services, which have access to your account. I started going through my social accounts and cleaning there.
That was a horrible mess, sometimes I did not recognize what is this service is used for and why I gave it permissions.
So, I've just decided to keep a list of links to social accounts settings, so I can revisit it sometimes and clean up again.
Here is a link to it: https://amureki.me/revokeaccess/ (GitHub)