The answer to how to write a social letter is as follows:

1. Hello friend, please give me your advice for the rest of my life.

2. A thousand cups of wine with a close friend is too little, and half a sentence without speculation is too much.

3. People who understand me can naturally understand me. People who don’t understand me don’t need you to understand me.

4. The most common noun in the world is friend, but the rarest one is also friend.

5. When friends invite you to a banquet, you can go slowly; when friends are in trouble, you must go quickly.

6. Relatives cannot be chosen, but friends can.

7. We know each other no matter how far we are, but we are still neighbors thousands of miles away.

8. The deer calls each other for food, and the felling trees call for friends.

9. Cherish every friendship around you. It may not last forever, it may be forgotten, it may be alienated, but it should never be forgotten.

10. Except for a true friend, no medicine can heal the heart. To a true friend you can convey your sorrows, joys, fears, hopes, doubts, remonstrances, and anything else that weighs on your heart. ——Bacon

11. Many people who appear to be friends are not actually friends, and many who are friends do not appear to be friends. ——Greece

12. Enjoying a small group of like-minded friends in society is the basic principle of human social attributes. ——Edmund Burke

13. A friend in need is a friend. ——Lenin

14. To make friends, you must make loyal people. Just as a smart doctor must check the pulse and examine the root of the disease before treating a disease, when making friends, you must also test the character of the other person, otherwise it will be dangerous. ——Ibn Mugafa

15. A person who does not even have a good friend is not worth living at all. ——Democritus

16. People who make temporary acquaintances cannot be regarded as friends. ——Bacon

17. If you want to make good friends, if you want the friendship to last, you must be humble and considerate to each other. ——Chaucer

18. A friend is a gift you give yourself. —— Stevenson

19. Friends are the sunshine in life. ——Ibsen

20. The older the friends, the better, and the older the wine, the more fragrant it is. ——John Ray

21. The difficulty in the meaning of a friend is that it has ever-changing meanings. ——Sanmao

22. The most beautiful thing in the world is to have a few friends with upright minds and hearts. ——Einstein