Yes, it's possible: Joomla users and single jomsocial users table can be shared, other JomSocial tables can be separate per site as usual.

Joomla users and single jomsocial users table, so all users will be same (both sites will have same users) but all other jomsocial data will be unique for each site.??

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It's impossible without creating separate menu item for Article (of Articles -> Single Article type) with alias 'article'.

... Note that images like avatars and photos won't be shared because each site uses own folder. You will need to setup symlinks to images folders from single site.

... the phpBB username in phpBB posts and other areas rather than the "Name" field in Joomla/EasySocial? Personally I'd prefer to have one single member profile and for that to be EasySocial. This is for example how you'd work with Kunena. I'd also prefer to use the "Name" (aka ...

It's a bad idea because you will have 3rd-party admins, note that single files are used, so any admin can delete any file or uninstall any extension - and all sites will be affected.
Single login on 200 sites will be also a problem.

... component... I need to make 200 sites with independent databases, because I need that all administrators has an own data. But I need to make a single login and logout. Can I do this? Please let me know to understand who I can integrate all the joomla sites. Thanks a lot. Alberto Silva

I think it's possible with MightySites: we can share only Joomla users and single jomsocial users table, so all users will be same (both sites will have same users) but all other jomsocial data will be unique for each site.

... except it needs to have a DIFFERENT Jomsocial installation. I want my users to be able to have access to both Jomsocial installations using the single login. This means "user 1" has one jomsocial profile and stream on the master site and a different profile and stream on the slave ...