How do I block people I do not want to chat with?
From the Friends tab, long-tap the person you wish to block and select Block.
To block a person on the Recommended Friends list, long-tap the person you wish to block or tap Block on their mini-profile.
If you want to unblock someone, go to the Friends tab, tap the three dotted button on the top-right corner and select Manage Friends.
Then go to Blocked Friends and tap Unblock.