Logging into Websites with FB destroys privacy - how do I fix this?

[sherry]

When I post on a website after logging in with Facebook (FB) it publishes my FB address. This means that anyone can get into my FB with the address even though my FB is locked. I really dislike FB because it takes too much time to manage it. I don't want FB to publish my FB address. It appears that it is impossible to remove once it is published. ( I signed up for an App that uses FB to log into other websites - this appears to be the cause) I want my address removed. And I don't want it to happen again in the future. Does anyone know how to fix this?

[DrDave]

What did you expect? You log in with facebook, you BECOME a member of that group. Get rid of these affiliations in your facebook settings and then DO NOT log into a site with it.

[Themba]

if u want blck permanently ur app then go to setting on fb then the apps and websites u cn select and blck it. you cn see the following link