If you are receiving unwanted messages from people asking you to teach them a language for free, it might be because these users are finding your profile in the "Language Partners" list and think that you are available for making friends and becoming language exchange partners.
If you do not want to be contacted by other members of the community, you can take these steps:
To change your settings, go to Account Settings.
In Account Settings, select Privacy.
The available options are
If you want to receive fewer messages, make sure this option is set to "Friends only".
If there is a specific user that you wish to block, you can:
A blocked user will not be able to:
When you block a "friend" or a user it is a completely silent action. The user will not know that you have blocked them as you will simply disappear from their contact list and they will not be able to search, follow or direct message you. They will receive no message indicating that they have been blocked by you as well. To the person who you have "blocked", it will appear as if you have deleted your account and do not exist anymore.
Blocking a User
Blocking the user will prevent this user from sending messages to you, adding you as a friend, and viewing things you share on your timeline. If you want to block a user:
If you have blocked someone by accident - Don't worry. You can always unblock them by following the steps here.