Hey guys,I just made a booru that's called 'HTFbooru'you can post whatever pics you want,like anime pics that are safe,shows that you wish were animes like HTF,Doctor who,etc..,also books you wish were animes like percy jackson and harry potter

That's great

Nice! I was considering doing the same but have yet to fully decide on the actual parameters.

out of curiosity does anyone know the name of this type of blogging site?

don't you mean blogger by google?

i'm asking if anyone knows where i could download the source code for booru type websites

I believe what you are asking is how to download a duplicate template of Safebooru's web architecture. See our front page
safebooru.org/ under the 'search' button there reads "Serving 1,260,986 posts - Running Gelbooru Beta 0.2.0"
where Gellbooru "Running Gelbooru Beta 0.2.5" and is an version of an "Original concept by Danbooru (danbooru.donmai.us/post_versions).'

That's the origin. But to create a 'booru,' you will need to 'create your own booru!' from www.booru.org/
If you were hoping to have an XML, PHP, C+, or HTML5 and work independently of the 'booru project' , you may be out of luck there.