Try. You can use it over web, but I feel that the best way is to use the iPhone app.
Definitely unusual, and although it may be too early for me to label it effective (It's just my third day of learning Spanish using DuoLingo iPhone app; I am loving it so far.), based on the reviews and articles that I have read about this app, this appears to be quite effective. In fact, a recent study found this to be more effective than other traditional methods:
Try it! Certainly, a better use of your free time thanor
The concept is called ReTargeting.
Here is a video from
The concept is not unique to Jabong. In fact, most eCommerce websites these days would deploy some form of retargeting mechanism, either built inhouse, or by using a third party tools like Adroll.
And indeed, as seen in screenshot below, Jabong is using Adroll for this purpose.
 The results are from a browser extension called Ghostery. If the website is using a popular third party tool for web-analytics, tag-management, ad-serving, or A/B testing, Ghostery will detect it.
A recent report from eMarketer suggests that number is about 33 Million
Personally, I would however recommend you to look at other sources too. eMarketer is usually a reliable source, but I am not fully sure of this study, especially because Twitter is banned in China, and the study lists China as the leading country in number of Active Twitter users. Some users may be accessing using proxy-services, but still this does not explain the extremely high usage.
Amit is one of the most common Indian names in my generation, thanks to immense popularity of, who also goes by Amit (the shortened version of his name). Hence, in my school days, I was always one of three or four Amits in the class. When I came to the US in 2009, I thought this would end, but instead, I started meeting Amit Bhatnagars too, in addition to lots of just Amits!
This has led to many memorable incidents: some amusing, and some irritating and frustrating. I am listing a few here in no particular order:
- When I came to the business school, I did not get the standard firstname_lastname B-school email address. Why? Because there was another alumnus from class of 2008 with the same first name and last name! Later when I met this guy at a university event, his first reaction on meeting me was "I have a bone to pick with you. One year, after graduation, I have suddenly started getting emails asking me to complete questions from team-assignments!" Apparently, my teammates were picking the first name suggested by auto-complete, and this was sending emails to the wrong Amit Bhatnagar!
- During one of the job-interviews, I did not receive the second round interview invite by email. Instead, I got a call from their travel desk asking for my details to book travel for second round. I followed up and got to know that I had indeed made it to the second round, but it appears that the recruiting coordinator had just assumed that my university email ID would be firstname_lastname, like everyone else from my school, and sent the second round invite to the other Amit Bhatnagar!
- At the pre-interview breakfast before the second round interview of the same company as above, all the candidates had an introduction session with the HR, where each of us had to share some elementary information and a “fun-fact” about oneself. I couldn’t think of a better fun fact than the Amit-story, and everyone had a good laugh at my situation! But more was to come: the fun-fact for the girl sitting next to me!
Believe it or not! Her husband’s name was “Amit Bhatnagar” (Yes, a third one!) and her university friends in the common interview invite list were thinking that both of them were appearing for the same interview!
- When I moved to SF, I met a distant cousin with same first and last names (Fourth, if you are counting!) We meet regularly at festivals and family gatherings, but thankfully, no confusing incidents so far!
Some incidents around just first common name:
- In the first year of engineering, four guys used to share one hostel room. Three out of four in my room were Amits! The hostel had a common phone for incoming calls from families of students (Most of us didn’t have cell-phones at that time), and one day, when Amit#2 turned up twice for phone calls meant for Amit #1 (me) and Amit #3, he instituted a rule: The callers should be asking for the person they want to talk to by their last name!
- At my B-school, there were four Amits in my class! Apparently, my B-school has a tradition of admitting Amits.. There were at least three Amits in each of three classes senior to mine!
- My wife's name is . Now, Priyanka is another very common Indian name. Incidentally, one of my very good school friends (another Amit) recently got married, and his wife is also named Priyanka! We haven't met after his wedding, but I can imagine the confusions, when we meet!
I had shared these experiences (and some more) on my blog some time ago:
and Anon-User have already demonstrated two mathematically correct ways of handling this. I will discuss a slightly less accurate, but a reasonably practical and relatively easy approach using Excel:
- Let the four square corners of the square sit at (0,0), (0,1), (1,0) and (1,1). So, the square center A will always be at (0.5,0.5). Now, take two random points by generating coordinates using Excel's rand() function, which generates a random number between 0 and 1, hence guaranteeing the coordinate to be within the square.
- Calculate the radius r of the circle by dividing the distance between Point1 and Point2 by 2
- Locate the center O of the circle by calculating the midpoint of Point1 and Point2.
- Calculate the length of OA, i.e. the distance between square center and circle center
- Define Success: Center of the square is with in the circle (r > OA). Assign 1 to success and 0 to failure
- Repeat the process a large number of times in excel and estimate the probability by dividing success count by iteration count.
- Press F9 a few times to refresh the data, and you will see that the probability is around 0.5
- (Optional) If you have access to any advanced too like @Risk from Palisade, you can automate step 6 for a number of times, and graphically see the probability converging around 0.5
A screenshot of my excel solution for this is included below:
Tags: Mathematical puzzles
Someone from Quora can confirm this, but based on what I have observed, I don't think they are using any third party tool for A/B testing.
I use a tool calledfor this purpose. If the website is using any of the popular third party platforms for web-analytics, tag-management, ad-serving, or A/B testing, Ghostery will be able to detect those. Of course, if you are doing this in-house, it won't detect anything.
This is what Ghostery detected for Quora:
So, it does not appear that they are using any of the popular third party tools.
Ghostery does detect most third party A/B testing tools, if present:
I am not aware of any Quora feature that allows you to do this, but I have the RSS feed of my answers synced to my blog (
Here is a sequence of steps that you can follow, if you have a WordPress blog (I am sure there are options available for other platform, but I have tried only WP)
- Install FeedWordPress plug-in on your WP blog.
- Grab the RSS feed for your answers. The format for the feed would be <Your Quora profile URL./answers/rss (For example: mine is )
- Optionally, you can also get the RSS feed for your questions (Replace "answers" by "questions" in above URL), or for whole of your activity log (
<Your Quora profile URL./rss). I was not very interested in having a backup of that.
- Configure the plug-in to post the RSS feeds as blog-posts on your blog. Set update-feeds to automatic if you want to. (I prefer to do manual sync every 7-8 days to ensure that one of my better answers is the top post on my blog)
- Take regular backups of your blog.
This mechanism will help you have back up of your Quora answers on your personal blog. This may be bad SEO for your blog because of duplicate content. So, you may want to have a different sub-domain for this purpose, something like.
BTW, since no step above needs your Quora credentials, technically, you can repeat the above steps to get the backup for contributions of any author. You may, of course, want to request the author's approval before posting his/her contributions to your blog.