Who are you saying Ello to? We’re all hooked on social media, so it’s only natural that we should love social apps — at least until we don’t. In 2014, one allowed us to shout “Yo!” to our friends, while another helped us share things anonymously, but we tired of both. Tech geeks flocked to Ello, a new, ad-free Facebook, but then didn’t stay. The takeaway? What’s cool today might not be cool tomorrow. So never stop innovating.