Share a post on Google+
You can share posts to collections, communities or with people. When you share a post, people following you, or the collection or community that you post to, can see it in their stream. Posts that you share can also appear on your profile.The content that you share publicly in Google+ is publicly searchable – even if your Google profile isn't. The content that you share to specific circles or with people is only searchable by the people it was shared with. There's no way to make the content that you share not searchable.
People can connect with you by commenting on, resharing or +1ing your posts.