Popular apps already have this built in (WhatsApp / LinkedIn / other social media platforms). My "killer" idea back then was simply putting a LinkedIn-qr-code

Popular apps already have this built in (WhatsApp / LinkedIn / other social media platforms). My "killer" idea back then was simply putting a LinkedIn-qr-code on back of my business card. Whenever I handed it over to someone (at a conference, mostly), they found it brilliant, scanned it immediately and sent a request on LinkedIn. The good things about this procedure were that: * I didn't need to keep random people's business card and forge who they were after a 3-5day busy conference, I just had to go to my LinkedIn, and could remember them by their face * vice versa: they could associate my contact accept with a face. Not to mention that this opened a more direct communication channel with a lesser chance to "ghost" me. I guess business cards are not really a thing anymore on the more popular conferences that target a younger (engineer) audience.