Some people find it tough to make friends because they're always worried about how people see them. It may be difficult for them to voice their true opinions. They often feel that agreeing with people will make them more likeable. But it's a burden to pretend that you are someone you are not.   These shy people can get some relief using the Internet to talk to people and make new friends. They are less nervous because they can think before they type instead of having to speak to a group of people. But a recent study in the journal Psychological Science shows that your attitude can still betray you when you're talking to friends online. People who suffer from low self-esteem may push more people away by trying to make friends on Facebook if they keep using status updates to talk about those bad feelings. Do you find it uplifting when friends are down about themselves? Of course not! And dreary Facebook postings don't inspire people to make friends with the person who is feeling so glum. As much as those with a negative self-image could use the friends, they tend to use Facebook in a manner that may push others away.   If you recognize yourself or some of your friends in that description, there is something you can do. If you're feeling down, speak to a trusted friend one-on-one, whether you use private messages on Facebook, e-mail, or get together and speak face-to-face. In contrast, when you are broadcasting messages for the whole world, or all of your Facebook friends, to see, try to stay positive. Remember the old saying: If you can't say something nice, don't say anything at all. It will help you to attract more friends and that will improve your attitude over time.

51. How does the saying "If you can't say something nice, don't say anything at all." apply in the passage?

(A) It relates to making others feel good about themselves by giving them compliments.

(B) It relates to pretending that you agree with everything other people say to you.

(C) It relates to boosting self-esteem by staying mute.

(D) It relates to saying only nice things about yourself while posting publicly on Facebook.