Reddit reviews After On: A Novel of Silicon Valley

This reminds me of the book After On: A Novel of Silicon Valley by Rob Reid.

Excerpt from the summary:

> Meet Phluttr - a diabolically addictive new social network and a villainess, heroine, enemy, and/or bestie to millions. Phluttr has ingested every fact and message ever sent to, from, and about her innumerable users. Her capabilities astound her makers - and they don't even know the tenth of it.

There's a chapter early on where characters buy drinks at a bar and then immediately see ads on nearby screens for that same alcohol brand begging them to buy more.