I use a product from a vendor, that makes me log in to their site every so often to collect the invoices from them I need for the accountant. Every time I do, I get followed by IBA for a week or so from that vendor -they seem to advertise a lot-.
I hate IBA as they follow you for *far* too long. Seriously: I'm single minded: if I search for something I go till I find what I need and want. Once done I'm not going back, so any and all IBA is coming too late.