As per the matter of building social network and on the purpose of promoting your business world wide, "Share" is better option as compare to "Like". You can easily promote your products on this type of social networking website, which can be easily view by new users regularly.
Currently, Skype is getting high attention as a best chat tool in all over the world. It get speedy popularity because of its great features and user friendly applications. I love to do video conference on it.