I feel like FB can affect my self-esteem depending on how I'm feeling that day, so it can be harmful to me. If it makes me feel bad, it's usually not because I feel others are more beautiful than me, but rather everyone seems to have a better/social life. I try to remind myself that the grass looks greener on the other side. What I see on FB may not be accurate. With your concern, try to remember that beauty fades. A physically beautiful person can be easily unattractive if they are ugly on the inside. A "less attractive" person can be one of the most beautiful people in the world because of who/how he/she is. There's always going to be people more or less attractive than you. Try to remember that and hopefully you can find a way to love and accept yourself the way you are, or improve yourself if you aren't happy. This is all easier said than done. Some days I'm up for the challenge and others, I'm not. Just remember that the suffering is temporary.