Don't send marketing emails to strangers! I opt out!
Over here in Europe where everyone seems to be on it chat via WhatsApp is really effective. Only used it for customer development & not hard sales though. Very very low barrier & personal.
If you spam me with SMS or on WhatsApp for sales, I'll just block it and not buy anything. Not sure how others would react, but to me it's just as intrusive as a phone call.
Unfortunately, I'm sure in 5 years no one will care and we'll all live with the spam.
Same here. If I'm not your costumer and I gave you permission, to reach me by whatsapp is an invasion of my privacy.
What makes a chat message via an application that you chose to install any different than sending you an email?
Well, by whatsapp you need my phone number, which I consider more personal / intimate than my email. At least me...