If you have to choose one language for your blog or website, will you write it in English or in your first language?

English, because I would like my ideas to reach as many people as possible.

For my website I would choose English, but maybe not so for my blog it depends on what the blog is about

Generally, English is widely accepted the world over and therefore it would make sense to write in English but it also depends with who is your target audience. It would make sense to write a blog using Mandarin if your audience is Chinese and so on....

I'd go for English, and I already have a blog that I write in English. My first language, Arabic, is a language I truly treasure, but English is more widespread than Arabic, and most Arabs do know English well enough to browse the internet. I think it depends on your goal audience and their characteristics. 

I'd choose English due to its wide spread among a large group of people which ensures bigger reach to a larger audience.

I prefer to go for English language. Thanks.

English. Because, English is an international language

I will prefer "ENGLISH" because of its status as an International Language and its accessibility / understanding to everyone who visit that blog or website.

Better to be in your language to easly spread in your country as a new big blogger