Excel has 100s of functions. Most them are not useful in day to day business setting. Here are the 10 most useful functions based on my 15 years of regular usage.
🧵

1) SUMIFS
Use it to add up values that meet one or more conditions.
=SUMIFS(A1:A100, B1:B100, "NZ", C1:C100, ">20") adds up all values in A1:A100 where column B is NZ and column C is more than 20.
2) XLOOKUP*
Use it to lookup a value and get corresponding value.
=XLOOKUP("Widget10", A1:A100, B1:B100)
looks the code Widget10 in column A and returns the price in column B.
* Works in Excel 365 / Web only
3) FILTER*
Use it to filter a list or range based on the conditions. Returns a range of values and automatically spills the values into next cells!
=FILTER(A1:C100, B1:B100="NZ")
returns the entire range of A1:C100 where column B has NZ.
4) COUNTIFS
Use it to count items that meet one or more criteria.
=COUNTIFS(B1:B100, "NZ", C1:C100, ">20")
tells us how many items have column B as NZ and column C more than 20.
5) INDEX
Use to it get a specific items from a list or range.
=INDEX(A1:A100, 12)
returns the 12th item in the range A1:A100
6) EDATE
Use it to calculate a future or past date after x months.
=EDATE(TODAY(), 6)
tells you what the date is exactly 6 months from now.
7) TEXTJOIN¹
Use it to combine text values in range with a specified delimiter.
=TEXTJOIN(" ",,"This","tweet","thread","is","awesome!")
returns the message "This tweet thread is awesome!"
¹ Works in Excel 2019 or above
8) UNIQUE*
Use it to extract unique values from a range.
=UNIQUE(A1:A100)
gives you the unique items in range A1:A100 by removing any any duplicates.
9) SORT*
Use it to sort a list or range by in ascending or descending order.
=SORT(A1:C100, 2, -1)
Sorts the range A1:C100 by column B(2nd column) in descending order (-1)
10) IFERROR
Use it to replace any formula errors with a relevant value.
=IFERROR(A1/0, "We can retweet this thread, but can't really divide by zero")
prints the message "We can retweet this thread, but can't really divide by zero"😉
11) For more on useful Excel functions, see these resources:
Top 15 Excel functions 👉 https://t.co/89m2aM6fYF
Advanced Excel Skills for you 👉 https://t.co/uRW5resifJ

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Recently, the @CNIL issued a decision regarding the GDPR compliance of an unknown French adtech company named "Vectaury". It may seem like small fry, but the decision has potential wide-ranging impacts for Google, the IAB framework, and today's adtech. It's thread time! 👇

It's all in French, but if you're up for it you can read:
• Their blog post (lacks the most interesting details):
https://t.co/PHkDcOT1hy
• Their high-level legal decision: https://t.co/hwpiEvjodt
• The full notification: https://t.co/QQB7rfynha

I've read it so you needn't!

Vectaury was collecting geolocation data in order to create profiles (eg. people who often go to this or that type of shop) so as to power ad targeting. They operate through embedded SDKs and ad bidding, making them invisible to users.

The @CNIL notes that profiling based off of geolocation presents particular risks since it reveals people's movements and habits. As risky, the processing requires consent — this will be the heart of their assessment.

Interesting point: they justify the decision in part because of how many people COULD be targeted in this way (rather than how many have — though they note that too). Because it's on a phone, and many have phones, it is considered large-scale processing no matter what.
The YouTube algorithm that I helped build in 2011 still recommends the flat earth theory by the *hundreds of millions*. This investigation by @RawStory shows some of the real-life consequences of this badly designed AI.


This spring at SxSW, @SusanWojcicki promised "Wikipedia snippets" on debated videos. But they didn't put them on flat earth videos, and instead @YouTube is promoting merchandising such as "NASA lies - Never Trust a Snake". 2/


A few example of flat earth videos that were promoted by YouTube #today:
https://t.co/TumQiX2tlj 3/

https://t.co/uAORIJ5BYX 4/

https://t.co/yOGZ0pLfHG 5/