Go was introduced as a system programming language, but I've noticed many start-ups use it as a web development language. My confusion is:
What kind of software is meant to be written in Go?
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Go is used in many ways. Google uses it for many purposes even within the company. It is also supported by the Google App Engine which means you can write web apps in it. Just by looking at these two examples, you know that Go has a infinite uses, so you can't really say that Go is suited for project X.
For example, look at a language like Python. It has been used billions of times by millions of people, but that doesn't mean they were all doing the same type of thing. Some were processing text, some were building web apps, some were generating Stack Overflow spam. When a language is as general purpose as Python and Go, you can't limit the language and say "This is a web development language!".
So, seeing as Go is a general-purpose language, we're not going to limit it here.
But the 3 bullets above are useless. Why? Because:
I can go on and on, and fine similarities between every single programming language known to man. I'm sure you can find the language that is most similar to Go, but does it really help you in any way?
So, to conclude my answer:
It seems I may have misunderstood the question a bit. Google Go is general purpose, and is mainly comparable to C/C++, although some people think the latter is much better.
According to Google Engineer Robert Pike, Go is meant for "big software". It is meant for quick, maintainable software. It is a systems programming language, meaning, well, it's good at programming your system.
Basically, Go can be used for many things, but it's not mainstream. There are not enough people using it for one thing to say that it is a web development language or otherwise.