Afaik the issue of whether you can see a team's fixtures and support them is down to what server they are on.

The separate but related issue of what server a friend will end up on (and whether you can see theirs) will come down to other things not covered in this thread because that was not the question.

I used a second existing fb account and friended it to my main then started a team and ended up on a different server. I created a third and referred it from my main and ended up on same server....and since one manager in my main's league switched teams the day before it even ended up in that league.

I'm sure there are many things beyond team availability, space etc that affect server allocation and these might even include some clustering factors that fb base on friends lists - and those might have determined where my second account team went as it had a whole host of friends, the main and third only had each other.

Who knows but to see in-game friends matches I believe its restricted to same server.