Hmm... yet again the confusion of extraversion with feeling is going on here...
Extraversion isn't about people. It's about orientation to the object/ to the outside world. There's a reason people say ENTP's are the "introverted extraverts" - we often tend not to be too interested in people, because with the T there, our E is turned towards the world of "stuff". That's why we often get on well with the ISTP, sharing an interest in "how things work" and tinkering with objects to figure them out/manipulate and adapt them to other purposes, etc. We can like and enjoy people, but it tends to be more because they're just such an easy source of external stimulation, and endlessly varied, a never-ending puzzle... not in the same way that feelers do, wanting to "connect" and suchlike.
That being the case, it's no surprise at all that ENTP's are usually very fond of learning and absorbing information. Personally, I dread looking things up on Wiki, because I just know I'll be there for hours!
Put it this way: when you pick up an object, examine it and look at it, are you more interested in the object and what it is and what it means to/for the world generally? Or are you more relating it to yourself, how it connects/relates to/is relevant to you personally and how it fits with or affects the ideas/opinions/knowledge you hold? The extravert orients themselves to/by the object, whilst the introvert orients the object to themselves.