Giving and receiving emotional support online: Communication competence as a moderator of psychosocial benefits for women with breast cancer.

Highlights: [•] Emotional communication competence moderates the benefits of emotional support. [•] Expressing support improves mental well-being for patients with high competence. [•] Expressing support decreases mental well-being for patients with low competence. [•] Receiving support reduces cancer-related concern for patients with high competence. [•] Receiving support increases cancer-related concern for patients with low competence. [Copyright &y& Elsevier]