Some Muslims have struck up such a bosom friendship with non-Muslims that when the non-Muslim dies, his Muslim friend puts out personal messages such

Answer

Firstly, such a message addressed to a dead person is extremely futile and moronic. Secondly, the Qur'aan forbids bosom friendship with non-Muslims. Thirdly, the Qur'aan Majeed states: "Do not say any prayers over any of them who has died nor stand at his graveside, for verily, he has committed kufr with Allah and His Rasool." Such futile messages of 'rest' and 'goodwill' for the kuffaar are haraam.