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What the hell is Instapaper?

From instapaper.com:

Instapaper is a fast, easy, free tool to save web pages for reading later. When you find something you want to read, but you don't have time now, you click 'Read Later'. When you do have time to read, you visit Instapaper on your computer or phone and get whatever you wanted to read.

Check out instapaper.com for all the details and to sign up.

Why do the 'Read Later' buttons display incorrectly for some people?

The buttons do not display correctly for visitors using Internet Explorer. Instapaper chooses not to support Internet Explorer, it has nothing to do with this plugin.

Is this an official Instapaper plugin?

No.