What cameras do people on Tumblr use to take pictures?

Seriously… How do people on Tumblr and Instagram take such nice pictures. Like I don't get it. When you use the iphone to take pictures it comes out a lil blurry but people on tumblr take high quality pictures. What camera do tumblrers use?

Nice pictures?
No.

They use their phones.

IPhone(GS3) cameras for the Instagram people, but most likely a wildly expensive Nikon if they're professionals on Tumblr.