I have found Twitter to be very useful for upcoming travel, promotions, etc.
I know there was a deaf FTer who used Twitter all the time to make seat changes or anything else that required a phone call. I've had good luck with them looking into issues of mine, and even making "one time exceptions" to help me out
I didn't know there was an online chat.
Fax is so outdated they just need to eliminate it. It's great that they support it, but I had to fax Aeroplan a document once. There was no email option. So annoying....
For email, are you referring to the SE address, or something else? I've only ever emailed aeroplan.documents, but that's the only way to deal with those issues.
Telephone has worked well for me for new bookings, existing reservations, changes, cancellations, refunds, etc.
I am not going anywhere near Facebook for communicating with them
Face to face is hit or miss. The times I've seen (in person) people get really frustrated are with questions like "Why didn't I get a new Elite card this year?" as if the MLL agent has any idea.
If you use the appropriate medium for your request, it's a lot less stressful