What are some alternatives?
When comparing YakYak and Skype, you can also consider the following products
Jitsi - Open-source video calling and chat platform.
Slack - A messaging app for teams who see through the Earth!
Wire - Private & Secure Messenger
Zoom - Zoom unifies cloud video conferencing, simple online meetings, group messaging, and a software-based conference room solution.
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
join.me - Instant screen sharing. Instant Aha!