There are a few reasons dlvr.it stops posting to your Facebook page. The most common cause is a change in your Facebook password.

When you change your Facebook password, you'll need to re-authorize dlvr.it to post to your Facebook page.

It's easy:

1. Log into your dlvr.it account.

2. Edit the Facebook Page / Destination you want to reauthorize

3. Click 'Reuathorize Tokens'

4. Sign Into Facebook to complete the re-authorization