Lyft is a Silicon Valley change-the-world, change lives, IPO moment. So was Facebook

While Lyft was preparing to go public this week in an IPO valuing the rideshare company above $20 billion, Facebook was preparing for something else: a lawsuit from the federal government over discriminatory housing ads.

That probably wasn’t in the minds of investors back in 2012 when the social network was the Silicon Valley start-up going public that would change the world for the better, and improve lives.

It certainly wasn’t the message being broadcast by founder and CEO Mark Zuckerberg, who wrote in a letter with the Facebook S-1 IPO filing that the company, was not just one more company, but “was built to accomplish a social mission — to make the world more open and connected. ... and improve the quality and efficiency of their lives.”