This is just a quick snippet for developers who have had problems setting up Jetpack locally.

Jetpack was recently updated to include a developers mode, because previously it required a connection to a WordPress.com account.  All you need to do to activate Jetpack locally, without connecting to wordpress.com is the following:

1. Open wp-config.php

2. Add the following line - possibly best below the WP_DEBUG line.

define('JETPACK_DEV_DEBUG', true);

And save the file.  Don't forget to change that on the live version!