the one who created the website introduces it to people "that are on the web."
這裡要看成 people that are on the web. 對嗎? 那中文就是 在網路上的人。 如果我想說的是 :
There is a person who created this website here. A group of stranges and a host are here, too.
The host ask the creator "could you show us your website briefly to audience? "

是不是寫成 Could you show us your website briefly about what there are the content of the website?

還是....這裡不合適用show, 一樣只能用introduce your website to people呢? 因為我常看到的字是show, 而introduce比較常看到母語人士用在 自我介紹 or 把誰介紹給誰認識。 我還在觀察這兩個字要怎用。

I have been here before, but I haven't gone back since. 這兩邊時態居然是一樣的，本來想說這很難理解，可是看到 before 跟 since 就好像可以理解了。 之後都沒去了 對你們來說 也是 a period of time 所以寫成 have not gone back。
就很像是 I have not gone back since I went to there. 對嗎?

1 Writing whatever I think of < 我超想學這句的，而且我一開始就是這樣寫，沒想到還真的跟原本想的一樣!

2 我發現 母語人士真的不常用 dislike 通常都用 don't 。 其實don't對我們來說就會很擔心會不會得罪人。 因為我們剛開始學到don't時，翻成中文的「不」，這個字很強調拒絕、負面等意思。 我想很難擺脫這種語感了，哈哈

3 How many users are there of your website? 居然是用of，我想到的是 在...裡面/上面 於是就寫成on。 I think I need more time to get used to this! lol

謝謝你 sivanc! Have a nice day : )

You could probably say "people online" more naturally. For your second question, I would rephrase as "could you give us a brief tour of the website?" "Introduce" is not really used here because that would more like, if the presenter were to talk about the concept of the website and what's on it, without showing it. The introduction is what comes before the actual demonstration.

Yeah, it's a shortened version of "I haven't gone back since (I went there the first time)," the listener can infer that from the previous clause.

If you wanted to be more natural, you could say "writing whatever comes to mind" or "writing whatever pops into my head." As far as dislike vs. don't, that was just because I rewrote your sentence entirely and that was just what came to mind. You can use either, maybe "don't" is a little more casual. With "of" vs. "on," prepositions are tricky, that one wasn't such a big deal either way. However, a similar situation is "what is your opinion of/on/about...?" and, there, "of" and "on/about" have quite different meanings.

我好像理解了！ 這時候要加入tour。 這個字常看成是演唱會，某某歌手tour， 所以只會想到歌手在大家面前唱歌,哈哈

確實tour就是有 親自在別人面前做什麼事的概念，對嗎？
Doing or speaking sth to people in personal. This is one of the concepts of this word "tour".

As for People online
你是說可以寫成 how many people online of your website? 這個意思嗎？