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Asked: 2026-05-29T10:16:09+00:00

I’m trying to understand the principle behind the Facebook plugins. As I understood they

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I’m trying to understand the principle behind the Facebook plugins.
As I understood they set a cookie when you login, and then whenever you visit a website with their plugin installed, they are abel to recognize your userId..

I’m trying to do it on my own on a couple of different domains I have, but I don’t know where to start actually…

I set a cookie TEST when I visit site1.com with a random id value

but then when i visit site2.com what should I do? I can I read the previous cookie that contains my id?

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  1. Editorial Team

    When you set a cookie in site1.com, whenever the visitor visits site1.com, the cookie would be sent to this website. There is no involvement of site2.com at all. site.com can not and should not be able to receive the cookie that was set by site1.com.

    If you are designing a page such that the user visits site2.com and the web page at site2.com contains an IFRAME that loads site1.com, then the cookie that was set by site1.com earlier would be automatically sent to site1.com when it tries to load it in this IFRAME.

    Also, note that these things are usually not done with JavaScript. Some sort of server side scripting such as PHP, ASP.NET, Django, etc. is used to set and read cookies sent by the client. Setting a cookie in the user’s browser involves adding a ‘Set-Cookie’ header to the HTTP response generated by the server-side script. In PHP this can be done using setcookie(). Once the cookie is set in the browser, when the user visits the same website again before the cookie expires, the browser sends the cookie as a ‘Cookie’ header. The server-side script can now read this cookie. In PHP, the cookies are available in $_COOKIE variable.

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