Twitter Now lets you receive Direct Messages from all followers:

Twitter is rolling out an option it ease the use of direct messages. Traditionally, Twitter has allowed user who follow each other to send direct message back and forth, or for users to send direct message to accounts that follow them.

A new setting, that appears it have been rolling out over the past week, allows Twitter users to receive direct message from any follower.

If you check this option any Twitter user that follows you will be able to send you a DM regardless of whether you decide to follow them back, says a note before the option in turned on.

@JimConnolly was one of the first to notice the new setting and tweeted a screenshot. Twitter has traditionally allowed users to send a DM only if both the sender and recipient follow each other or to accounts who follows the sender.