[tomjakubowski]

No interest group or club that I've belonged to has ever stuck only to that topic in discussion.

[TheCoelacanth]

Of course not, but it does provide an easy conversation starter that paves the way for other topics.

[pizza234]

Are you referring to the IQ? So, a conversation starter like "Hi! What's your IQ"?

I've never heard it, and I don't think anybody, except people with incredibly poor social skills, would use it.

[TheCoelacanth]

I'm thinking about more typical clubs and interest groups. In a chess club, you can talk about chess without worrying about whether the person is interested in chess. In an underwater basket weaving club, you can talk about underwater basket weaving without worrying about whether the person is interested in underwater basket weaving.

[pseudalopex]

Social clubs aren't rare. Most people like to discuss current events. And few turn down opportunities to talk about themselves.