Actually not. Day by day the value of Facebook is decreasing and Instagram is increasing. It's not that Facebook has been left behind but people are liking Instagram more than Facebook.
You post this a year ago and we can see now that they are definitely not dying just changing their form. Facebook is used less and it's more suitable for older people now, but it's not dead, especially when it comes to groups and pages. Instagram seems to even grow with new options, and I think this tendency will continue at least for some time in the future.