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<?php

// Instructions: Open class.jetpack.php, search for:

/**
* Is Jetpack active?
*/
public static function is_active() {
    return (bool) Jetpack_Data::get_access_token( JETPACK_MASTER_USER );
}

// and replace with this:

/**
* Is Jetpack active?
*/
public static function is_active() {
    return true;
}