Build something that's got most of the well-known features of Facebook, plus/minus whatever you feel like you need to change with regard to privacy, business mo

Build something that's got most of the well-known features of Facebook, plus/minus whatever you feel like you need to change with regard to privacy, business model, decentralization, etc. You can do all of this for much, much less than $1B. The only thing you're missing is two billion users. Use the remaining funds to stir up sensational controversies that make people wary of Facebook, lobby governments around the world to harass Facebook, and offer monetary awards to get influential groups of people (e.g. schools) to switch to your platform. Once you've got a bit of momentum, spend the last few million dollars to hire a bunch of shady guys to take out Facebook's leadership and infrastructure -- either physically, with bombs and guns, or virtually, with very powerful malware. By the time they recover (if ever), you're the one who has two billion users. This is how you destroy a company when you're actually intending to do so. For the rest of us who don't want to get our hands dirty with guns and viruses, I suspect that $1B and the lofty goal of disrupting Facebook are actually going to get in the way. Facebook won't be disrupted by something that's trying too hard to disrupt them. Zuckerberg will see the competition coming from a mile away and respond with $2B, $3B, or more. The key is to come up with something that's so completely different from Facebook that they'll have a hard time even seeing you as legitimate competition. You fly under their radar, make no headlines, and refrain from making ambitious statements like "I want to disrupt Facebook" until you've created a whole new market and they can't pivot to compete with you. The reason the illegal solution above works is because Zuckerberg doesn't expect to be assassinated on his morning jog. Do something that's just as unexpected, only legally this time.