Jeremy Herve thanks for the quick response! It is always nice to see a tech savvy person like you that quickly answers to questions! :)
If you wanted all Jetpack modules to be deactivated by default, you could use the following code:
add_filter( 'jetpack_get_default_modules', '__return_empty_array' );
If I want to do that, I just need to write this line and nothing else in function.php?
And than manually activate each module...?
Thanks in advance!