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Hello @SunsetRunner, thanks for joining us, it's great to have you on board! 
When you block a person, you will no longer be able to see him/her on your leader board and it won't appear on your friend list, the same happens on his/her side, therefore he/she will no longer be able to send you private messages. However, in a group Challenge, the person will still appear and he/she will be able to see your message and you'll still be able to see his/hers as even if you have blocked a person, some others might not and will still have the option to invite him/her.
I hope this resolves your inquiry, if there's anything else I can do for you, please keep me posted!
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @Stone98, I hope you're having a great day, it's nice to see you around! 
As mentioned above, when you block a person, he/she will no longer appear on your friend list and you will be removed from his/her friend list as well, this will prevent this person from sending you private messages.
To block a person:
- Open the Fitbit app and tap on the Community tab on the menu at the bottom.
- Tap on Friends.
- Tap on the name of the person you'd like to block.
- Tap on the ellipsis (...) icon at the top right corner and select Block User and in case you like you can also remove the person by tapping on Remove Friend.
I hope this can be useful, if there's anything else I can do for you, please keep me posted!
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @mills8868, I hope you're having a great day, it's nice to see you around.
Please note that even if you have blocked a person, if you're both on a challenge, you will be able to see each other and your profiles. However, the blocked person won't be able to see the other person's personal stats (only the profile and background images), the "Add Friend" button will still show up but in case the blocked person sends a friend request, it will not arrive to its destination.
Now, is my recommendation, to prevent your privacy, that you go to your personal stats and change your personal data by going to Account > Your Name > Privacy Settings and set each individual stats to be seen only by you or by your friends:
I hope this can be helpful, if there's anything else I can do for you, please feel free to reply.
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @Dundeal and @Pooh_22, thanks for joining the Fitbit Community, it's great to have you both on board.
@Pooh_22, if you accidentally blocked a friend, go to the Fitbit app and tap on Account. Scroll all the way down and you will be able to see "Blocked users" tap here to get the list of people you have blocked, tap UNBLOCK on your friend's name and picture, this will unblock your friend and will send a friend invite.
@Dundeal, if you have blocked a user, this user will not be able to see your friends and you will no longer show in that user's friend list.
I hope this can be helpful, if there's anything else I can do for you, please feel free to reply.
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