a hint when joining, build your profile, list your interest (apple), favorite sport team, post to conversation, and use your real name so Google Police don't close your account.
I know when i check a person's profile and they have NO post or nothing listed in their profile, i don't add them to my circles. There are plenty of Apple People.
Gaining Circles and adding people make it interesting, getting involve with topics creates a want to constantly visit, or get push notification on the iphone.
I was getting so many notifications i turned off the push and manually check-out topics. Adding people who contribute to conversations makes your circles interesting, and gives you a better opportunity to post.
Invitation received..thx dude..gave it a try it's not as appealing as I thought It wld be..may b coz it's just a beta version..hope d real deal has more to offer