Pinned toot is your home if you know:

\textit{idf} = - \log \frac{n_t}{N}

and... everyone else!

Pinned toot

Dear all,

For now, I will keep the site closed for registrations; but everyone can independently invite people to join using the following link to generate an invite:

If you know someone who wants to join this instance, then please do give them an invite!

Consider the instance open for those who know anyone on

"Sense of community" and an initial seed of some 40 IR researchers should be enough to keep those spammers out of here and still grow the club!

Pinned toot

Computer scientist 👨‍🏫 with main focus on Information Retrieval 📄

Also interested in Data Science / Big Data 💾

In the previous millennium :mastodon: a PhD on Multimedia Databases 🎥 (Yes that was a respectable research topic once upon a time pre-birdsite!)

is my academic home.

Entrepreneur: co-founder of ( admin.

Loves indie music: follow me at @arjenpdevries if you are interested in gigs, events, etc.

Pinned toot
Pinned toot

Inaugural toots on using a photo of lunch with Nick Belkin after attending the now Dr. Hugo Huurdeman defense.

See also:

Added :trans: to

Because it makes some ppl happy! And I do not have to ask the Unicode Tech Committee 🙂

Kaart met groene initiatieven in Utrecht Oost is flink bijgewerkt door netwerk Groen Oost op

Yahoo Groups Shutting Down: All Content from 115 Million Groups to be Permantently Deleted Dec 14th:

Google acts like the local mafia beating up your store, and then asking your for protection money...

Our Bibliometric-enhanced Information Retrieval workshop goes into its 10th iteration! Join us at ECIR 2020 in Lisbon, Portugal! Submission deadline is January 27, 2020. More info -

Academics and practitioners working in search! Our BCS Search Solutions 2019 event for presentation of the latest innovations in search and information retrieval takes place November 26 in London. More info, programme and registration at We also offer an interesting tutorial programme on November 25 (the day before the main event). Please check out

We are organizing the WSDM workshop on conversational systems for recommendations and search (ConvERSe), details available at:
Inviting long, short, position papers & posters.
Submission deadline: Nov 15 2019

How to tell a true friend: they strip the tracking identifiers and amp junk from a url before sharing it with you.

Exciting announcement: Matomo Analytics for WordPress beta has launched 🚀 🥳.

Get a fully functioning Matomo in seconds with our new WordPress plugin.

Beta testers, we'd love to get you involved. Please let us know what you think 💃🕺

Read more:

I created an easy way to customize a #Tusky build since it was requested by instance admins.
Please have a look and give me feedback.
@jaz @inditoot

PeerTube Index: search engine for videos across PeerTube instances.

Rewarding myself for getting first ECIR paper submitted.

Great new song by Big Thief:

Sorry to the neigbouring offices!!

Cross-posting from Linked-in.
/cc @dpg

Enjoyed giving a lecture on "Bias in Recommendations" at the SIKS Course "Advances in Information Retrieval," where I explained a bit about our challenges in working with implicit feedback (clicks), and was happy to discover Thorsten Joachims' seminal paper on implicit feedback late yesterday evening in preparation of these slides 😉!



Pinafore v1.14.0 

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The "unofficial" Information Retrieval Mastodon Instance.

Goal: Make a viable and valuable social space for anyone working in Information Retrieval and related scientific research.

Everyone welcome but expect some level of geekiness on the instance and federated timelines.