Direct messages let you have a private, one-to-one conversation with another person. They are separate from your posts: only you and the other person can ever see a direct message. This page covers who you can message, starting and continuing conversations, sending photos, and deleting or restoring messages.
Direct messages are free for everyone, including sending photos.
You can only message people you follow each other: you follow them and they follow you back (both follow requests approved). You also cannot message someone if either of you has blocked the other.
If you can't message someone yet, follow them and wait for them to follow you back. Once you both follow each other, they'll appear in your recipient list.
Unread messages in your Inbox show a small blue dot. A badge in the navigation shows how many unread messages you have.
There are two ways in.
From the Messages page:
You'll be taken straight to the conversation, where you can keep chatting.
If the list is empty, it means no one who follows you also follows you back yet.
From someone's profile:
Visit their profile at /user/[username]. If the two of you follow each other, a Message button appears next to Follow, and it opens your conversation with them directly. If you don't see the button, you are not mutual followers yet (or one of you has blocked the other).
Open any conversation from your Inbox or Sent list to see the full back-and-forth, oldest messages at the top and newest at the bottom. Type in the box at the bottom and send to reply. Older messages load as you scroll up.
Opening a conversation automatically marks its messages as read.
You can attach photos to a direct message, up to 8 per message. Photos are resized automatically. You'll need a verified email address to send images (check Settings if you haven't verified yet).
Deleting a message never marks it as unread and never touches the other person's copy. A message that both people have deleted is eventually removed for good.
Direct messages are private to the two people in the conversation. The other person can never tell whether you've deleted your own copy of a message.