On uninstall, the module threatens to delete any blocks that have ever had a visibility group, even if the group has been removed.
1. Assign a visibility group to a block and save.
2. Edit the block again, setting 'visibility groups' to 'no block visibility group' and save.
3. Uninstall the module. It will warn that it is going to delete the block.
The block is not actually deleted, it seems, but the warning is very disconcerting.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
@guilhermevp: Were you able to work out a solution for this?
On uninstall the block configurations should be disabled and their configuration changed to no longer reference this module. I'm just not sure how to do that.
After three years I'm going to assume guilhermevp didn't get to compile the work, so I'm opening it up for others to work on.