Found this being used as a tag on several questions. I don't really think a company (or even if it is being used as a tag for the search engine exclusively) is a good tag for the UX Site. Should we remove it?
There are a lot of non-UX tags in our tag-wiki and we need to think why they exist. Users (with the privilege) create tags by themselves to sort information among these 5000+ questions. A tag being used on five or more questions is relevant in some context (maybe not UX, but on another facet).
Still, questionable company and company-feature tags are around in our tag wiki. Like the following (non-comprehensive) list:
The Windows tag is noted by the DO NOT USE wiki, but I doubt it has the desired effect.
I think we should be very careful if we’re going to change or remove tags, especially if they are used a lot. They will most certainly come back leading to the doubtful work to sort tags out again and again. I think the best option is to leave them as they are, since it helps our users to sort questions (and answers).
Tags exist to help people find stuff and subscribe to things they're interested in. So a [google] tag sounds useful to me. I know I think Google design is fascinating and I work with a lot of their software, so it's useful to me that it exists (I also added a few of those tags).
I don't think we should make any kind of rules like "tags of companies aren't allowed". Tags that make sense should be allowed, regardless of whether they're a company or not.
As for some of the others, like windows-phone-7: that's a platform we as designers target. So it's very relevant to the questions here as some design must obviously be changed for specific platforms and will lead to questions specific to that platform.
When you see a tag, ask yourself this question: is the word in the tag related to the question? Is the question about this word? If I wanted to find this question in a search, would I use words used in this tag? If I wanted to subscribe to questions similar to this one, would this tag be useful?