One of the most important rules in donating organs or bone marrow is to maintain the anonymity of the donor and recipient, including from each other.

But with more people using the internet and social media, there are cases in which identities may be revealed, worrying organizations such as the Japan Organ Transplant Network and the Japan Marrow Donor Program.

In a monthly newsletter published by the latter on Jan. 15, an article called for reinforced measures to prevent letters exchanged between the donor and the recipient from being posted on social media and elsewhere.