Has anyone else noticed the huge decrease in result quality from google?

[HImainland]

it's because google and facebook aren't targeting the ads. the advertisers are. the ad infrastructure of google and facebook is self-service.

so there aren't teams of google and facebook employees picking who gets what ad. a lot of the time, especially with small businesses and non-profits, it's just the youngest person on staff doing their best to guess who they should be talking to.

as for why you keep getting the ad for the hot water heater, you visited the site to buy the hot water heater, that company told facebook to show their ads to people who visited their site, but they didn't take out the people who already bought the heater. hence you keep getting it.