As compared to Facebook that will index and put ads on them. There is no lesser evil here - not in principle at least. All firms seem to be in the same business of selling advertisements. Facebook might be able to do better display advertisements as compared to Google and they seem less intrusive to users - a viewpoint that I subscribe to. But other than the extent of intrusion, both Facebook and Google are using the data you provide for targeted advertisements.
[Edit: Typos]