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I can't be sure what it is but it just stuck out to me because it was so spot on and the job was actually roughly in my field which has nothing to do with the core business of that company.
You are probably right and it's browsing history and not just any browsing history but the browsing history on this forum.
Some of the things I could be a fit for:
Luxury Garment Technologist
Junior Blockchain Developer
Production Co-ordinators, Eurovision
Non-Scripted Commissioning Executive Apple TV+
GPU RTL Design Intern
Store Swapper London (PT) Swapfiets
Temporary Videogame Tester
Travel Security Program Manager TikTok
Assistant Manager Foot Locker
Part time News Content Editor – Polish/German speaker
Volunteer with Elephants in Thailand
Live producer - Mountain bike
Witness & Case Review Officer British Transport Police
Speechwriter/Editor Shell
Luxury Travel Consultant
Personal Assistant The Mail on SundayImagine one person could be all that.
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It's also browsing history / clickthroughs / engagement of people that you are directly and tangentially linked to.
That's the really insidious part, that you can't do anything about at all (short of installing all the scripts & ad blockers / cookie managers on all of the devices of all of the people in your wider network, and encouraging private & proxied browsing) . It's also incredibly valuable to the platforms.
Why would you assume Teams and not the browsing habits of everyone working on an ad for this company?
There's got to be like an order of magnitude more chance it's just people in your org doing internet searches about said company and you guys are already linked because you work for the same company.
Also, if this company is paying you to make ads, it's just likely they're also simply pushing more ads out via other means.
Also, how do you know it's not LinkedIn? Someone in your team added them to a list of clients or chatted about them (does Linkedin have DMs? I have no idea)
You can reduce obvious 'chat' data sharing by doing things like disabling gifs and link previews: https://learn.microsoft.com/en-us/microsoftteams/teams-privacy-oce-overview