Sorry, but you're not coming across as a very serious person when trying to create a group this way.
If you were any sort of knowledgeable expert, would you even bother to consider joining a team of a complete stranger (and dedicate your precious time to him)?

If you just want to discuss things, why do you want to do it in a closed group? Why not discuss any subject you're interested in publicly, either or this forum or on other ones? This way you could meet similar-minded people naturally, gain some reputation and then build a team (if you need one at all), rather than expect anyone to commit without having a clue who are they even talking to.
Just a thought.