Postcrossing Blog

On our open poll, many of you asked to see more statistics on the blog, so we thought we’d introduce a new series of posts all about Postcrossing and numbers. And what better way to start than by looking at some of the data from the year that just ended, right? Let’s do this!

5,425,005 postcards received

That’s right — almost 5.5 Million postcards were registered last year, which was pretty neat! We’ve just passed the 45 million milestone a few days ago, and are on track to celebrate the big 50 later this year. Woohoo!

25.7 days (average) and 17 days (median) travel time

Do you know the difference between an average (or mean) and a median? To calculate the average of a set of values, you sum all the values in your set and divide them by the total number of items in that set. This is great if your values are more or less well distributed, but outliers (both large and small) often distort the end result disproportionately.

Enter the median, which can be roughly described as the “middle” value of a data set. If you put all the travel times in a looong ordered line, 17 days would be the value in the centre of this distribution. This is a more reliable value to determine how many days most postcards travel before reaching their destination. Some will be quicker, some will be slower, but on the whole, postcards seem to travel somewhere around 17 days.

27,380,992,088 km (or or 17,013,759,698 miles) of total traveled distance

That’s… yeah. I don’t have words for it neither. We’re way beyond Pluto at this point!

19,985 km (or 12,418 miles) was the longest distance traveled by a postcard

Below is the postcard that traveled the longest distance last year. Can you guess between which countries it was exchanged?

It’s a trick question because of the content… but if you guessed New Zealand and Spain, you’d be right! Postcard NZ-155857 traveled between a pair of antipodal points: from the north tip of New Zealand to the south part of Spain.

916,800 postcards were sent from Germany 🇩🇪

Germany was the most active country last year, with almost a million postcards sent from there! Here are the other countries and territories in the top 20:

hepman sent the most postcards

Dedication and a speedy postal service helped the Germans climb to the top of the charts, where they took most of the top spots! Here are our 20 most avid postcrossers:

And that’s it for last year’s numbers! If you’re hungry for more, Postcrossing has a group of pages dedicated to statistics where you can find more data to explore.

Late last year, Deutsche Post and Berlin’s Museum for Communications launched a video competition themed “Why do we still write letters?”, where people could post videos explaining the charm of written mail. They got over 400 video submissions, which you can see on their YouTube channel. They’re sweet, touching stories of why we still put pen to paper to write to to each other.

We only heard about the competition once it was over, but were happily surprised to find a video about Postcrossing among the entries! Have a look:

Johannes (aka joze-post) made this charming video, which does a great job of portraying the randomness of Postcrossing. He didn’t win the competition… but he stole our hearts with the cheerful music and fun details about some of the postcards. Well done Johannes! :)

Good news, everyone! We’re happy to announce that Russia, the country with the largest number of Postcrossing members, is releasing a themed stamp to commemorate the project on January 27th!

The 23 ruble stamp was designed by O. Shushlebina, measures 37×37 mm and comes in sheets of 9 stamps. Here’s what it will look like:

Quite nice, isn’t it? I think you can guess what it says, even if you don’t know much Russian! :)

To celebrate the occasion, three postcrossers in Novosibirsk, Tomsk and Moscow decided to hold a lottery to offer 60 lucky members the chance to receive a postcard with this stamp and the first day cancellation mark! If you’d like to participate on this giveaway, just leave a comment below saying you’d like to receive one. We’ll draw 60 names by the end of the week, and send your addresses to the members who are going to write you a postcard.

You might find a surprise postcard on your mailbox in a few weeks! :)

As promised, the first post on our behind-the-scenes series is about address validation. This is the process through which we check that all addresses in Postcrossing are (to the best of our knowledge) correct and complete.

“Red alert! Red alert! I think that one over there is missing the postal code!”

Addresses are one of the most important things in Postcrossing. Wrong or incomplete addresses would result in postcards being delayed or not delivered, and general unhappiness – which we would like to avoid.

There is specialized software to process addresses of course, but it’s either dodgy, specific to a country or just crazy expensive for our size. So, we chose to do this task ourselves, splitting the job between Paulo, Vicki and I. Each one of us picked a set of countries according to our strengths and learnt the UPU address format of those countries by heart. Most countries have their own format – and some are much simpler than others. We use this knowledge to go over thousands of addresses per week, spotting invalid ones, or just rearranging the order of the elements on the address. Most of the time, addresses will be read by automated sorting machines, which expect them to be written in a certain way. So if every address is formatted as UPU recommends, everything will go faster!

What makes an address invalid? Lots of things:

• Parts might be missing: name, postal code, country name, etc.
• The address might be written exclusively in the local script (Chinese, Thai, Cyrillic), making it hard to write for people who don’t understand that alphabet or those without a printer.
• The address might be completely translated into English – which is usually a bad idea. For non-Latin scripts, transliteration works better and faster in our experience.
• The address might not match the account’s location/country.

Technology helps with the last item on that list, because we can usually match your IP address to the location you’re signing up from. For instance, if a member with an IP address in Canada is opening an account in Fiji … something might be wrong, and we have to look into that. :)

A few postal operators also provide a list of all valid postal codes for their country, giving us the ability to automatically detect typos or invalid postal codes.

“Let’s just add the country name here at the bottom… I think it’ll help!”

The whole process of validating addresses has been streamlined over the years, but it still takes quite a bit of time, since every single new address needs to be checked and validated. We’ve been doing it for so long that by now we can tell at a glance whether an address is valid, incomplete or just in a strange order. We might not find all the problems – but we do spot lots of them!

Plus, we’ve learnt many nice things in the process too! For instance, did you know that an address in China should be written from the biggest component (province) to the smallest one (adressee) if written in Chinese characters, but the other way around if written in Latin characters? Or that there are no street names in Japan? Or that every house and building has its unique postal code in Singapore? It’s amazing!

I think that’s it for addresses, so I’ll leave you with one last tip: make sure that you write the address on your postcard exactly as it is shown – it’s already optimized for that country!

I hope you liked this first post on our behind-the-scenes series – we’ll get cracking on the next one! :)

“So… what do you do for a living?”

We get this question a lot, Paulo and I, especially at Postcrossing meetups. When we explain that we both run Postcrossing full-time, people often seem surprised to find out that the website doesn’t work automatically by itself. :)

Of course, static pages can almost run on auto-pilot, but Postcrossing is not static and it is constantly growing. Every minute that goes by, the website is being used and changed simultaneously by thousands of you, with hundreds of new members joining every day! At this scale, even some of the simplest tasks can be greatly amplified. Take for example, answering emails, finding postcard IDs, validating all the addresses or moderating the forum – these are some tasks which gradually became time-consuming for our small team.

But there are other, less visible things that we do, that are no less important. For instance: servers are maintained to keep the website running snappy and safe, code is developed, updated or fixed and we regularly improve our address selection algorithm so everyone can have a better experience. On the less technical side of our days, we keep in touch with postal operators, answer media queries and create content for this blog, among other things. So, overall, there are many small (and some not so small) tasks that keep us busy running the site.

Since so many people are surprised when we mention our job descriptions, we thought it might be interesting to show you what it’s like to run Postcrossing – and what it looks like “behind the scenes”. The first post on the series will be about address validation, and it will be posted in a few days.

Meanwhile, we’re collecting ideas for future posts, so this is your chance to chime in! Is there any part of what we do at Postcrossing that you’d like to know more about?