Yelp has posted an open dataset for challenging, http://www.yelp.com/dataset_challenge.
Hundreds of academic papers written in the past two years. All those could be found through scholar.google.com
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"business_id": "vcNAWiLM4dR7D2nwwJ7nCA",
"full_address": "4840 E Indian School Rd\nSte 101\nPhoenix, AZ 85018",
"hours": {
"Tuesday": {
"close": "17:00",
"open": "08:00"
},
"Friday": {
"close": "17:00",
"open": "08:00"
},
"Monday": {
"close": "17:00",
"open": "08:00"
},
"Wednesday": {
"close": "17:00",
"open": "08:00"
},
"Thursday": {
"close": "17:00",
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}
},
"open": true,
"categories": [
"Doctors",
"Health & Medical"
],
"city": "Phoenix",
"review_count": 9,
"name": "Eric Goldberg, MD",
"neighborhoods": [],
"longitude": -111.98375799999999,
"state": "AZ",
"stars": 3.5,
"latitude": 33.499313000000001,
"attributes": {
"By Appointment Only": true
},
"type": "business"
}
{
"votes": {
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},
"user_id": "Xqd0DzHaiyRqVH3WRG7hzg",
"review_id": "15SdjuK7DmYqUAj6rjGowg",
"stars": 5,
"date": "2007-05-17",
"text": "dr. goldberg offers everything i look for in a general practitioner. he's nice and easy to talk to without being patronizing; he's always on time in seeing his patients; he's affiliated with a top-notch hospital (nyu) which my parents have explained to me is very important in case something happens and you need surgery; and you can get referrals to see specialists without having to see him first. really, what more do you need? i'm sitting here trying to think of any complaints i have about him, but i'm really drawing a blank.",
"type": "review",
"business_id": "vcNAWiLM4dR7D2nwwJ7nCA"
}
{
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{
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{
"user_id": "-6rEfobYjMxpUWLNxszaxQ",
"text": "Don't waste your time.",
"business_id": "cE27W9VPgO88Qxe4ol6y_g",
"likes": 0,
"date": "2013-04-18",
"type": "tip"
}