Answer:
1. Internet.
2. Cell Phone.
3. Digital Cameras.
4. Personal Computers.
Step-by-step explanation:
According to their impact as inventions, this should be a reasonable order.
Why internet first? Because this global network was able to connect the whole world, after its invention and effectiveness, history era changed as the Era of the Information. Internet had so great impact that today, governments can be taken down just cutting their internet servers.
After Internet, Cell Phone and Digital Cameras have almost equal impact, because these have a improvement impact, which means that these existed before but analogical. So, cell phone allowed people to communicate faster and whenever they wanted, which is huge, because the information exchange is almost immediately. Digital Cameras have great impact if we though its applications, like satellites.
Finally, Personal Computers had an impact but by themselves, without Internet, don't have big importance.