Jetpack offers fancy looking only, it's extremely heavy plugin, and wasting server resources so much. I use Jetpack Lite http://wordpress.org/extend/plugins/jetpack-lite/ and works much-much-much nicer than this one. Even though, the Lite Version is also consuming memory a lot, but it's still far better than Jetpack.
If anyone want to use this ridiculous plugin, you need to have one file PHP.INI in your wp-admin folder, to allocate memory allocation to make this plugin works.
And this is the PHP.INI configuration you need to have inside your wp-admin:
;; set memory limit for admin-functions.php; admin-header.php; admin-post.php, admin.php
#memory_limit = 5000M
register_globals = on
Jetpack is not ethical at all. They just FORCE people to download and use it. ShareDaddy, LaTex, Deadline, are just ridiculous features that consume huge memory and server CPU heavy loaded.