Safari 3rd party cookie iframe trick no longer working? I have faced this same problem while developing the Facebook application.
I found a good stuff in stack overflow
<IfModule mod_headers.c>
Header set P3P
"policyref=\"/w3c/p3p.xml\", CP=\"NOI DSP COR NID CUR ADM DEV OUR BUS\""
Header set Set-Cookie
"test_cookie=1"
</IfModule>
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