Making thought-based sharing possible
Currently the only way of sharing a brain is by sharing the whole brain with someone else, or make it publically available where the private thoughts won't be visible. It would be very interesting to share individual thoughts that can be added in someone else's brain, without making it public.
It makes sense, for example, since I could share a project I'm working on with someone else, which is linked to other peojects/people that the other one is not allowed to see (and vice versa).
Making a new brain and copy the thoughts is not the way how it should work, it decreases the value and effectiveness totally.