Additional friendly reminder that Bloomberg sees Facebook as the biggest threat to its existence and is extremely motivated to report negatively about them
The overlap of the two businesses is likely counted in single digit percentages of revenue.
Sorry that I don't have numbers
They sell a software terminal at about $20k/yr subscription, and there are > 325,000 paying subscribers. It's nearly an essential tool in finance. https://en.wikipedia.org/wiki/Bloomberg_Terminal.
It's pretty neat, there's some really interesting tech and history involved but it's all hidden away in a very insulated industry.