I get that companies have to make money and so advertising is part of that process, but, for me, online ads really wind me up. What usually happens is that I buy something online, then for the next month, I receive pop-up ads about the thing I just bought. It's really irritating and feels like overkill. I suppose that it's not the advertisers' fault, but the fault of the internet server but it really gets my goat, especially if my sister has used my computer and I get hit with lots of ads for things directed at her.