Guild Wars 2

Hello, this is my second post here today, and I hope that’s okay. I have been reading up about guilds and the megaserver system, and would like to confirm something. It seems guilds have a main server, but my understanding is you can join a guild with people from different servers. Is this correct? Say, my German friend’s home world was a German server, and mine was a different EU server. We would be able to play on the same map, but would we still be able to join the same guild, or have the rules changed? Thanks.

You can join the same guild, no problems. They all changed it with the big patch last september.
The only thing that will not work is doing WvWvW together, since everyone has to fight for his homeworld (= server).
Anything else like guild missions, guild chests, etc. will be shared across all worlds.
For example: my homeworld is an EU-World (Far Shiverpeaks), while my guild was founded on a german world (Drakkar Lake).

An informative answer, thank you.

Nicely put Nash.