20140505 - victor gau - r to access the social graph from facebook
DESCRIPTION
Some basic concepts of using R to access the social graph from the Facebook.TRANSCRIPT
R TO ACCESS THE SOCIAL GRAPH FROM FACEBOOK
Victor GauLightning Talk @ Kaohsiung useR! Meetup
2014/05/05
Outline
What is the Social Graph? Graph API Explained What is JSON? “R” to Parse JSON Spider Revisited “R” to Access the Social Graph Using Facebook Developer Tools Topics for Sharing Next Time
What is the Social Graph?
Business Insider: So What The Heck Is The 'Social Graph' Facebook Keeps Talking About?
Graph API Explained
APIs for accessing social graphHTTP requests are sent to access the social
graph (the responses are in JSON format)most requests are sent to
https://graph.facebook.com requests for videos are sent to
https://graph-video.facebook.com
https://developers.facebook.com/docs/graph-api/quickstart/v2.0
Graph API Explainedhttps://www.facebook.com/HTC
Graph API Explainedhttps://graph.facebook.com/HTC
What is JSON?
JavaScript Object Notation http://en.wikipedia.org/wiki/JSON
“R” to Parse JSON
Install “rjson” packageinstall.packages(“rjson”)
Load “rjson” packagelibrary(rjson)
Functions to use:fromJSON()toJSON()newJSONParser()
Sample Code - Reading JSONdata = '{
"firstName": "John",
"lastName": "Smith",
"isAlive": true,
"age": 25,
"height_cm": 167.64,
"address": {
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021-3100"
},
"phoneNumbers": [
{ "type": "home", "number": "212 555-1234" },
{ "type": "fax", "number": "646 555-4567" }
]
}'
person <- fromJSON(data)
person$firstName
person$lastName
Spider Revisited# Load Required Packages
library(RCurl)
library(XML)
# Get Page Source
html = getURL("http://www.ptt.cc/bbs/R_Language/index.html")
# Parse to get information using XPath
xml = htmlParse(html)
Xpath = "//div[@class='title']/a//text()"
titles = xml [Xpath]
“R” to Access the Social Graph
# Load Required Packages
library(RCurl)
library(rjson)
# Retrieve Data (in JSON format)
data = getURL("https://graph.facebook.com/htc", ssl.verifypeer = FALSE )
# Read JSON
htc <- fromJSON(data)
“R” to Access Social Graph Access Token would be needed for
certain content in social graph most of the time.
Access Token can be retrieved by using graph explorer from Facebook Developer Tools.
Sample URL for retrieving information with Access Token:http://graph.facebook.com/me/friends?
access_token=XDFAFDFXXXXXXXDAFDA
Using Facebook Developer Tools
https://developers.facebook.com/tools/
DEMO
Topics for Sharing Next time Authentication Social Plugins Open Graph Protocol FBML XFBML FQL …
Thank you!