I have upgraded iphone6 but Facebook not working

Please try uninstalling and installing the messenger app on your phone again. Once you uninstall please clear cache first before installing afresh

you have to format the mobile with factory reset on iphone to get back all your defaults settings and siri back if it wont work you can see the tutorials for that on youtube.

Hey you not need to worry Mac support number 1-877-778-89-69 will help you.
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Have you checked the server details are correct?
Username is normally in the format of either the full email address or the Domain\username. Your mail provider should be able to provide you with this information

This commonly happens to users who have not upgraded to Facebook Gold.

Try a Gold upgrade preview to see if that works.

Please upgrade my ayi to my Facebook

To enable Facebook chat, follow this instruction about the HTTPS (secure browsing).
To turn on Secure Browsing (https), navigate to your Account Settings page. Click the "Change" link next to Account Security, check the box under "Secure Browsing (https)" and then click the "Save" button.
If this doesn't work, upgrade your browser. If you are using IE8, upgrade it to higher version.

It recommends to upgrade the browser of your operating system. So that you will get better performance by upgrading your browser.