Hey. It's been a long while. I have a few questions if someone could help me out?

1. Do spaces have a paid option just like groups?

I'm looking to create a management system for a individual business communities with 100+ people in each community to stay in contact with each other.

2. I'm wondering if I should use groups or spaces for each business to keep everyone connected? It looks like spaces is identical to groups, except spaces allow for additional groups within groups. Is that the only difference?

3. Is this possible? Every time a specific person posts in a group or space, every user in the group gets a browser notification of that post?

4. Groups and spaces can be private right?

5. Can a user follow someone and be notified when that person posts on their profile?