Skype spam
The only reason I have Skype is that I seem to work in a lot of offices with WiFi but no mobile signal. I can rent a landline number that I can give to people who might want to call me. If anyone can suggest a good alternative, I'd be interested.
But I'm heartily sick of Skype spam. I get numerous contact requests and even (unanswered) calls from exotically-named women that I've never heard of. What's the business model here? I can understand email spam - it's as easy to send a million messages as one, so the infinitesimal response rate is still profitable. But phone call spam sounds much more time-consuming, and where's the payoff?