It would be nice if we could group/send tells cross-server.

Maybe I could actually meet some new people I meet while doing dungeons and you know, actually be social in an MMO where 80% of the game is in duty finder but you meet people you will probably never see again nore care about
Or you can meet people on your server and use the DF as little as possible. The point of the DF is to find a group to run 1 run of an instance; not to meet people.

I didn't find the right solution from the Internet.

References:
http://forum.square-enix.com/ffxiv/threa...ls-cross-server.

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