Destroy Steemit?
- Nope. I don't think so.
What you need to take into consideration is the insane amount of people though, so it will obviously become some sort of competitor to Steemit... But Facebook is already a competitor, just without the potential to earn money. If and when he gives people the opportunity to earn from their contributions, he will become a threat, but he won't be able to destroy Steemit.
- And why?
Most due to the fact that you can't do whatever you want on Steemit. You're not allowed to speak freely. You're censored the minute you start to say things that others doesn't like or appreciate. You're not entitled to your own opinion on Facebook... Meanwhile that's exactly what Steemit is about. A non censored platform.
What matters is what we Steemians do to get people onboard and that everyone truly realize that Steemit is groundbreaking and that it will change everyone's beliefs and thoughts about what "Social Media" really is. - When that happens, no other platform will have a standing chance.
Just my 2 cents.
I guess that you meant facebook ie on your comment above...I agree..good point