people opt-in to google when they use it to search - they want to find something, and if an ad helps them do that, ok! people opt-in to using gmail, gdocs, gch

people opt-in to google when they use it to search - they want to find something, and if an ad helps them do that, ok! people opt-in to using gmail, gdocs, gchat, because they want to be more productive, and if an ad eventually leads them to do that, ok! Ok maybe this isn't so true but come to think of it, I've never once seen an intrusive non-textual ad in any of those services ... people are not opting in to facebook in search of services or to be more productive. They are there to hang out with their friends. Nearly any ad in that context can be labeled as "not wanted". Let me ask you something, do google text ads really bother you? what about facebook ads getting added to the stream? If yes to either; why?