Add custom registration meta

I’m basically trying to add several checkboxs to the registration page so the user can choose what blogs to join however I am unsure of where I can find the code to submit this.

First function adds code to meta in wp-signups works fine.

Second function should get this meta which is does however i cant access anything inside it using the likes of $signup[‘meta’] or $signup[‘$user_id’]

Currently using buddypress hooks should be a similar process.

add_filter( 'bp_signup_usermeta', 'custom_add_signup_meta' );

function custom_add_signup_meta ($meta)
{
// create an array of custom meta fields
$meta['user_blogs'] = $_POST['blogs'];

if($meta != null)
{
return $meta;
}

}

add_filter( 'bp_core_activate_account', 'add_user_to_blogs');

function add_user_to_blogs($signup)
{
global $bp, $wpdb;
$role = 'bbp_participant';

//test output is 1 :S
//echo 'ALL = '.print_r($signup).'';

foreach ($signup['meta']['user_blogs'] as $key => $value )
{
//Stuff
}

}

Any ideas?