Is working for Facebook & Google haram and even take online courses for certificationfrom such companies offering for future job?

I'm really confused and I need a clear answer. I'm in a doubt whether I should take this Google's project management course and it's certification for future job offers or not? And is it haram to work for Google & Facebook since most of their revenue comes from advertisement?? And isn't most of their advertisement including bad stuff??? What should I do? Should I not go for the course Google is offering? And is working with such companies haram? Please explain clearly with evidence from the Shari'ah