You subscribe to individual communities. So unless a user or the admin already subscribed to a community there won't be any content there from those communities.
Even after subscribing only new content (and old content that has had replies/likes) will show up.
You subscribe to individual communities. So unless a user or the admin already subscribed to a community there won't be any content there from those communities.
Even after subscribing only new content (and old content that has had replies/likes) will show up.