My experience with Glassdoor is that there is a significant amount of non-disgruntled employees reporting. I think this is because if you want to look at their data, you have to put in some details about your own employer. Certainly most people are writing either milquetoast feedback that gets them through the door or moaning about their employer so the information is biased, but it's not quite Yelp. Either way, Apple has 154k employees, it's such a large company that it'd be surprising if in aggregate it was the best place to work.

Exactly, it's not like the culture/pay/environment really changed. Apple's really quite an old school place to work (like you pay for lunch?!?). Also, it's so huge that there are radically different parts of it (even just retail vs hardware vs software vs ID).

More an indictment of Glassdoor's methodology.

It surely isn't.

My company forced us to write reviews there and you can be sure they expected good ones. Worked out pretty well as far as I could see.

Isn't the first time I've heard about companies doing that.

Even if they'd rely solely on reviews from disgruntled employees, the amount of those would also say something meaningful.

Actually yelp is great?

An obvious difference is you can see photos of food and decide for yourself how it looks -- so I'm not so much defending Glassdoor (which I don't use) as I am defending yelp. As far as yelp reviews, you can generally tell when the reviewer is unreasonable.