Credit: Harry Campbell

Five years ago, I imagined a website that would show how people were connected to each other in real life, so I built a prototype called ­Friendster. I decided that one of its central features would be a friend confirmation process. When you wanted to add someone as your friend, an e‑mail notification was sent with your request. If--and only if--the person approved your request, you were both listed as each other's friends. Five years later, I am paying the price for this innovation as I face an avalanche of friend spam. I get several friend requests per day from Friendster, MySpace, and Facebook, and also from social-media services such as Yelp, Flickr, and Pownce.

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