Snapchat had decided it needs to IPO to fight Facebook

Snapchat's IPO is coming in the first half of 2017, in an offering that could value the hot social networking app at $25 billion. 
The company, which recently rebranded itself as Snap and announced plans to branch into hardware, is set to be the tech industry's biggest Wall Street debut in years. The IPO market has been somewhat dormant of late, and it's become fashionable among some tech companies to resist going public.
So why is Snapchat going public?
A source familiar with the matter te