Sign

Signs are supposed to be perceived differently by each person. I don't know if any of the three you mentioned really qualifies. Especially the Facebook one; that is just creepy.
To reveal fondness men are usually overly polite and (non-sexually) complimenting- to me, anyway. Other people might want different things from a 'sign'.

About signs,

I think it's more by feeling, the feeling you get. Signs can be fake sometimes, but the feeling you get inside is a better way I think. But sometimes, I can tell by the eyes, when the eyes kind of sparkle, it's a sign there is something or when a person is very shy sometimes it means they like you :)

Here is an example: I go to Starbucks allot. There was a girl form Korea who worked there and made my drinks, she was also a student here. When we talked she was always shy and didn't say much but she had a bright look in her face. Then sometimes she would run and hid men the back of the store, I thought maybe she didn't like me or was hiding from me but later we needed up dating for about a year while she was here. I asked her how come she used to run away from the cash register and hide in the back many times, she answered because she liked me allot and was so shy she didn't know what to do or where to look, we shared some very good time :) So if I went by here sign I would have thought she didn't like me but was opposite :P I think it can be complicated.

Will write more later :) Have to go out soon :P

Have a Great day

Smiles

Ron :)

Signs are different for everyone. For instance, if a guy simply smiles at me, I don't think it's a sign. Maybe he's just nice. However, if he keeps smiling at me often, I might think it's a sign. If a guy came to ask me about something very general that almost anyone understands, I would think it was a sign, because he chose me out of everyone. However, if it's something specific that only really I know, it's not a sign.
The last example you listed...is creepy.

I'm really dumb to see a sign, lol. If a person is interested in me, they better tell me, because I will never see any signs. Which can be hard for a guy.

Once, on a dance floor, when I was 15 years old, this girl would come an find me for every slow song. I didn't know her at all, not even her name. During the whole song, she would stare into my eyes. When each slow song finished, she would go back to her friends. When the next slow song came on, she would come find me again. Finally, during the fourth slow song when we were dancing together, I wondered if she wanted me to kiss her, and I wondered if that's why she was staring at me. So I decided to kiss her. It was exactly what she wanted. When the song finished, we stopped kissing and she smiled and pulled me tighter to her. After that song, she did not return to her friends, but continued to talk to me for the rest of the dance.

If someone could read the signs, they would have kissed her during the first song, I think, but it took me four songs to see the sign. I am really dumb at seeing signs.