Will graduate schools in the United States and abroad accept an online college degree

[shoron]

I have been researching online colleges for quite a few days now. I understand colleges like Excelsior, WGU, and TESU provide a valid bachelor's (master's too) degree. They have been accredited, so there are no questions about their authenticity. I am convinced about that. But my questions are:

1. Will graduate schools like Harvard & MIT accept these degrees? No, I know they are very selective. Not everyone will get the chance to be enrolled. But Having an Excelsior degree is a minus there, or is the validation quite the same?

2. How can I determine if schools in other countries/continents like Canada, Europe, and Asia will accept these degrees?

3. What if I enrol in a "not so reputable" graduate school and get a master's? If I want to do another master after that from a "reputable" one? Will that ease up the process?

4. (this one is traditional, but I don't know) If I get a bachelor's degree in Business from Excelsior, Can I do my masters in CS from another graduate school? 

Getting answers to these confusions will help me go through the journey, and I will be grateful to you guys. Thank you so much for your attention and participation.