"The mere fact that the selection of adverts you are presented with in your social feeds, search engine searches and banner advertising changes over time is proof of this ongoing optimisation."
You just don't get it, do you?
To go all Bob: I BLOCK ADS.
And I HAVE NO SOCIAL FEEDS. Zilch.
Don't let this stop you telling your clients you can send me advertising. If you could your selection would undoubtedly be for those things I've already bought or stuff I don't want.
An example of the latter. If, for geographical reasons, I search for a place name, the results will be swamped with estate agents sites for that area despite the fact that I have no intention whatsoever of even going there let alone buying a house there. It's not a phrase I'd use often but I feel sorry for those estate agents who are being bilked for fees to put that crap in front of me.