Advertising yourself?

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The other day I sat in a party where the talking was very livid and fun. We were some 10 ppl and everything got discussed and talked about. But at some point, I got an odd feeling. I knew that some of the ppl wanted to expand their feelings towards each other, and during the night I kinda got the feeling that they were kind of "advertising" themselves to each other with some of what they talked about or said. One of them highlighted something about themselves I felt was both out of character but also ment to peek an interest, and that was the first gib in me that something else was going on :D I never really paid much attention to this before, and I was actually having a silent laugh everytime I paid attention to it. I find it pretty fun that ppl advertise themselves to make the other person aware of them or more interested in them. And pretty sneaky as well lol. Have anyone of you paid attention to this before? I know I will probably unwillingly pay more attention to it for a while at least as I find it very fun :D