"THE WAY BIG INTERNET PLAYERS RANK INFORMATIONS IS CHANGING OUR LIFESTYLE.

A WALKTHROUGH INTO THE RANKING ALGORITHMS AND THEIR APPLIED IMPLEMENTATIONS

CAN HELP US UNDERSTAND HOW INFORMATION FLOWS BETWEEN PEOPLE . 

CASE STUDY ON FACEBOOK & GOOGLE "

RANKING

MARCELLO BORZI

TECH LEADER @ JOBRAPIDO

NERD & GEEK

@MARCELLOSOUND

WHOAMI?

http://www.linkedin.com/in/marcelloborzi

A RANK ALGORITHM IS A SET OF RULES THAT DEFINE WHAT IS MORE REVELANT (OR PROFITABLE) TO BE SHOWN TO USER .

WTF IS A RANKING ALGORITHM?! 

"IF IT ISN'T ON GOOLE IT DOESN'T EXIST"

JIMMY WALES, WIKIPEDIA FOUNDER

 PAGERANK WORKS BY COUNTING THE NUMBER AND QUALITY OF LINKS TO A PAGE TO DETERMINE A ROUGH ESTIMATE OF HOW IMPORTANT THE WEBSITE IS.

THE UNDERLYING ASSUMPTION IS THAT MORE IMPORTANT WEBSITES ARE LIKELY TO RECEIVE MORE LINKS FROM OTHER WEBSITES.

“THE MORE LINKS YOU GET, THE MORE IMPORTANT YOU ARE”

PAGERANK

http://www.google.com/competition/howgooglesearchworks.html

PAGERANKSIMPLIFIED FORMULAE

I.E. THE PAGERANK VALUE FOR A PAGE U IS DEPENDENT ON THE PAGERANK VALUES FOR EACH PAGE V CONTAINED IN THE SET BU (THE SET CONTAINING ALL PAGES LINKING TO PAGE U),

DIVIDED BY THE NUMBER L(V) OF LINKS FROM PAGE V.

http://en.wikipedia.org/wiki/PageRank#Simplified_algorithm

PAGERANKTHE DAMPING FACTOR

THE PAGERANK THEORY HOLDS THAT AN IMAGINARY SURFER WHO IS RANDOMLY CLICKING ON LINKS WILL EVENTUALLY STOP CLICKING. THE

PROBABILITY, AT ANY STEP, THAT THE PERSON WILL CONTINUE IS A DAMPING FACTOR D. VARIOUS STUDIES HAVE TESTED DIFFERENT

DAMPING FACTORS, BUT IT IS GENERALLY ASSUMED THAT THE DAMPING FACTOR WILL BE SET AROUND 0.85

http://en.wikipedia.org/wiki/PageRank#Simplified_algorithm

PANDA!

“OUR GOAL IS SIMPLE: TO GIVE PEOPLE THE MOST RELEVANT ANSWERS TO THEIR QUERIES AS QUICKLY AS POSSIBLE. THIS REQUIRES CONSTANT TUNING OF OUR ALGORITHMS, AS NEW CONTENT—BOTH GOOD AND BAD—COMES ONLINE ALL THE TIME.” THE GOOGLE BLOG

http://www.google.com/competition/howgooglesearchworks.html

SEO RANKING CORRELATION2013

GOOGLE +1 : 0.40FACEBOOK SHARES :

0.34NUMBER OF BACKLINKS : 0.34 FACEBOOK TOTAL :

0.34FACEBOOK COMMENTS: 0.34 PINTEREST: 0.31

TWEETS : 0.28

http://www.searchmetrics.com/en/services/ranking-factors-2013/

BACKLINKS REF=NOFOLLOW: 0.25

"A SQUIRREL DYING IN FRONT OF YOUR HOUSE MAY BE MORE RELEVANT TO YOUR INTEREST RIGHT NOW THAN PEOPLE DYING IN AFRICA"

MARK ZUCKENBERG , FACEBOOK CEO

http://www.whatisedgerank.com/

WHAT IS AFFINITY?Affinity is a one-way relationship between a User and an Edge. It could be understood as how close of a "relationship" a Brand and a Fan may have. Affinity is built by repeat interactions with a Brand's Edges.Actions such as Commenting, Liking, Sharing, Clicking, and even Messaging can influence a User's Affinity.

http://www.whatisedgerank.com/

WHAT IS WEIGHT?Weight is a value system created by Facebook to increase/decrease the value of certain actions within Facebook. Commenting is more involved and therefore deemed more valuable than a Like. In the weighting system, Comments would have a higher value than a Like. In this system all Edges are assigned a value chosen by Facebook. As a general rule, it's best to assume Edges that take the most time to accomplish tend to weigh more.

http://www.whatisedgerank.com/

WHAT IS TIME DECAY?Time Decay refers to how long the Edge has been alive; the older it is the less valuable it is. Time Decay is the easiest of the variables to understand. Mathematically it is understood as 1/(Time Since Action).As an Edge ages, it loses value. This helps keep the News Feed fresh with interesting new content, as opposed to lingering old content.

http://www.whatisedgerank.com/

http://www.whatisedgerank.com/

THE SECOND LARGEST JOB SEARCH ENGINE ALL OVER THE WORLD

TO HELP ALL JOBSEEKER ALL OVER THE WORLD TO FIND A JOB

34 MLN JOBSEEKER58 COUNTRY

20MLN ADVERT / DAY

JR.RANKING“OUR GOAL IS SIMPLE: OPTIMIZE THE CLICK PROBABILITY FOR ANY ADVERT SEEN ACCORDING TO SOME RELEVANT INFORMATION

𝑹𝒂𝒏𝒌 ( 𝑨/𝑺 )=𝑷 ( 𝑨 /𝑺 )∗𝑨𝒅𝒋𝒖𝒔𝒕 𝒇𝒂𝒄𝒕𝒐𝒓

𝑷 ( 𝑨 ,𝑭 𝒊 )=(𝑨𝒗𝒈 ( 𝑨 ,𝑭𝒊 )−𝑨𝒗𝒈 (𝑭 𝒊 ))

𝑨𝒗𝒈 (𝑭 𝒊 )

𝑷 ( 𝑨 )=∑𝒊=1

𝒏

𝒘 𝒊∗𝑃 (𝐴 ,𝑭 𝒊 )

JR.TIPS“LA SIMILARITÀ TRA DUE WORDS W1 E W2 PUÒ ESSERE MISURATA IN BASE ALLA LORO

PROPENSIONE A COMPARIRE NELLO STESSO TOPIC”

MARK STEYVERS

𝑷 (𝒘 /𝒒 )=∑𝒊=1

𝒏

¿ ¿

AND FINALLY …

WTF IS THE FILTER BUBBLE ?

ELI PARISER (BORN DECEMBER 17, 1980) IS THE CHIEF EXECUTIVE OF UPWORTHY, A WEBSITE FOR "MEANINGFUL" VIRAL CONTENT.

HE IS A LEFT-WING POLITICAL AND INTERNET ACTIVIST, THE BOARD PRESIDENT OF MOVEON.ORG AND A CO-FOUNDER OF AVAAZ.ORG.

WHO IS ELI?

http://en.wikipedia.org/wiki/Eli_Pariser

SINCE DEC. 4, 2009, GOOGLE HAS BEEN PERSONALIZED FOR EVERYONE. SO WHEN I HAD TWO FRIENDS THIS SPRING GOOGLE

"BP," ONE OF THEM GOT A SET OF LINKS THAT WAS ABOUT INVESTMENT OPPORTUNITIES IN BP. THE OTHER ONE GOT

INFORMATION ABOUT THE OIL SPILL...."

http://www.brainpickings.org/index.php/2011/05/12/the-filter-bubble/

http://www.brainpickings.org/index.php/2011/05/12/the-filter-bubble/

http://www.brainpickings.org/index.php/2011/05/12/the-filter-bubble/

http://www.brainpickings.org/index.php/2011/05/12/the-filter-bubble/

THINK OUTSIDE THE BOX

THINK OUTSIDE THE BOXINSIDE

“A WORLD CONSTRUCTED FROM THE FAMILIAR IS A WORLD IN WHICH THERE’S NOTHING TO LEARN ... (SINCE THERE IS) INVISIBLE AUTOPROPAGANDA,

INDOCTRINATING US WITH OUR OWN IDEAS.”

—ELI PARISER IN THE ECONOMIST, 2011

http://www.brainpickings.org/index.php/2011/05/12/the-filter-bubble/