You can view which accounts you have blocked in your user settings, and unblock the user(s), if desired. You can also unblock a user by viewing the user's profile page.
Open User Settings
To open your user settings, click the Me icon in the toolbar , and then click the Settings link .
View Blocked Accounts
If you have blocked any accounts, they will display on the Blocked Accounts page.
To unblock a user, click the Unblock button.