All the big online stores probably do it, but is it alright for them to target your purchase and future purchases at the store as they know what you have been looking at for the last 12 months.
I say fine if it also comes with a further incentive like a discount to make you hit the buy button. A new beta version of an app is going to be trialed shortly at an online store. Be interested to know how well it works. That being you have stalked a particular item in that store or elsewhere online and now when you go to this store it will push that product in your face. I know it's not new, but this algorithm is meant to be more targeted again.
Suppose it's all about making the sales experience better. I don't have to weave through pages of keyboards in the online store. The one I like will be the first that appears when I start searching. Saves time.
UPDATE: Said store had sales go up by $250k in week since beta app upload into their site. Must work. So you're looking at one item then suddenly your now spent another $800 on something else either associated with that original purchase or from your previous search on the internet.
Until some company pays to have their item appear first…