I understand, but I have two counter points: * I disabled UO, and I can see no ads on twitter, other than the occasional promoted tweet. * Ads can be served v

I understand, but I have two counter points: * I disabled UO, and I can see no ads on twitter, other than the occasional promoted tweet. * Ads can be served very discretely (as pointed out above), and doesn't have to "bloat" a client from a sub-1MB to a 20MB app. Ads also doesn't have to adversely affect (much) how fast something loads. A third point would be how much gain ads actually drive, but that's another discussion.