Can I get a job in Facebook, Google after MCA?

Yes of course if you are pursuing this course from a good university and if study with the proper plan throughout your academic year you will get it easily. I am a Lovely professional University student so I can tell you LPU has the best teacher for this course in the Master of Computer Applications

If you are strongly skilled in respective areas, you can definitely get the job. Even you don't need for computer science degree then. For more information, read here: https://careers.google.com/how-we-hire/#do-i-need-a-computer-science-degree-to-be-a-google-software-engineer