How To Get Custom Options and Display in HTML

In my admin, i have a custom option that allows a user to add their twitter and facebook name. It saves it perfectly. I can’t for the life of me figure out how to display the twitter and facebook entry on the front end in an insertFootNote function that displays html beneath each post. Can anyone help?

My Registered Settings portion of the admin that saves the data:

register_setting(
            'mp_option_group', // Option group
            'mp_options', // Option name
            array( $this, 'sanitize' ) // Sanitize
        );

        add_settings_section(
            'setting_section_id', // ID
            'Link your social accounts', // Title
            array( $this, 'print_section_info' ), // Callback
            'my-setting-admin' // Page
        );  

        add_settings_field(
            'twitter', // ID
            'Twitter Name', // Title
            array( $this, 'twitter_callback' ), // Callback
            'my-setting-admin', // Page
            'setting_section_id' // Section
        );      

        add_settings_field(
            'facebook',
            'Facebook Name',
            array( $this, 'facebook_callback' ),
            'my-setting-admin',
            'setting_section_id'
        );

and the output:

global $mp_option_group;
foreach ($mp_options as $value) {
    if (get_option($value['id']) === FALSE) {
        $$value['id'] = $value['std'];
    }
    else {
        $$value['id'] = get_option( $value['id'] );
    }
}
function insertFootNote($content) {'
<p>Hello ' . $facebook . '
';
}