(https://techcrunch.com/2008/01/06/adverlets-joins-the-deadpo...). I might not have made a unicorn, but at least I'll get to name one.
At least you won't start as TheFacebook.com did, but I can take you halfway there on the journey to FB.COM. As Mark said, if he were to do anything differently, he would double down on domains. (If you don't believe me...Mark.com is a very suspicious trove of beautiful names that the owner seems to be in absolutely no rush to sell).
So, if names like mezej.com, usezeal.com, memopen.com, chartdom.com, easynear.com, typeinto.com, raress.com, siteim.com, strategizable.com, uxkin.com, tribechoice.com, weaponizable.com...sound like a great start for your new venture, let me match you with your perfect name. From USD199 - USD2999. (I have over 400 more if these aren't to your taste)