Magento LogIn with Facebook Account extension
Create Facebook App.
For Facebook Connect to work you need to Setup Application on Facebook and obtain its API Key and Application Secret.
Use your store name as application
name and read and accept terms of service. On second screen switch to Web Site tab and set Site URL to the store domain where you plan to implement Facebook Connect. Save Changes. Other Connect settings are optional, but you might want to add store logo for example.
Step 2.
Download extension from link below:
Works_Facebook_Login
unzip folder and copy app folder from Works_Facebook_Login and paste it to you magento folder it will ask to overwrite click ok.
Step 3.
Magento Setup
Once you obtain two keys navigate to Magento Administration, copy/paste them to appropriate fields under Configuration->Customer->Facebook Connect, set Enabled to Yes and you’re good to go. If you’re updating from previous releases, you also need to Enable it to work.
Default template files (frontend/default/default/template/facebook/*) and layout (layout/facebook.xml) makes Facebook Connect work out of the box with default theme, but we tried to make customizations as easy as possible so all you need to do is add button or link with “facebook-connect” rel attribute set anywhere in the theme, static block or cms page, for example:
<button rel=”facebook-connect” class=”form-button” type=”submit”><span>Connect with Facebook</span></button>
<a rel=”facebook-connect”>Connect with Facebook</a>