Think about this. You're having a conversation with someone you vaguely know at a cocktail party or a dance at a school. EVERY TIME you want to say something, you say it, then you say, Oh, wait, here's my card, please read it, it's all about me.
Rather, if you want to get to know someone better, you pull them aside and ask about them. Or you pull them aside and tell them about yourself. In the same way, you can very easily go the person's public profile, read more about them, see an additional photo or graphic. See their home page if they have one and read their comments about themselves. THAT's ENOUGH.
Every little post does not require a full-blown personal advertisement.