I heard about few of those projects, but in my opinion the industry is still too young to compete in social media sector. Such giants as Facebook would never allow their audience to switch to a more safer space, so they will do everything to stop this.
For me i only use one platfrom from the list before which is bela i just heard this platform from facebook.
Too far if you campare it facebook also the platform has a different audience compare to facebook. People of that platform want to earn compare to facebook that it is use for communication from local to different country.