It's 11.47pm, the throw has won, and an 18-second video shows you a wool jacket that moves exactly the right way. You haven't opened a website, checked your size or compared two tabs: your thumb moves, and the purchase can be made without leaving the feed. Black Friday has changed location — it no longer happens in the aisles, it happens in the feed.

The shop is now thumb-sized

What has really changed isn't the product; it's the number of steps between wanting something and paying for it. Before, you had to leave the video, find the brand, retype the reference and hope the size was still there. Now the piece can be within thumb reach, on the same screen as the woman walking in it. And that's exactly where the battle is: whoever shortens the journey gets the sale.

For brands, the argument is easy to grasp. An 18-second video shows how trousers fall better than four photos on a white background: you see the fabric move, the cut hold and the silhouette lengthen. The budget that used to go on banners is moving into content and paid partnerships. The question for you isn't whether it's clever — it is — but whether the price shown in the feed is still a good price once delivery and returns are added.

When prices shift during a live stream

In a live stream, prices and promo codes can change while the broadcast is running, and countdown offers give your basket the feel of a last train. That isn't a trick in itself; it's a pace. The simple fact is that a price seen at 10pm commits you to nothing the next morning, and you are rarely told whether it was lower last week — there's no price history pinned to the thumbnail.

Hence the obvious reflex: screenshot the price, basket contents and total including delivery, then check the retailer's official website to compare. If the difference is small, buy where returns are clear. And if you're still undecided, sleep on it — so can your basket.

'Only three left' and the difference between displayed and real stock

A counter going into overdrive is a display, not proof. It reflects what the seller claims at a given moment, which isn't the same as the stock held by the retailer whose name you recognise. An item can reappear, a size can come back, and manufactured urgency has never made a jacket more flattering.

What deserves your attention is the product page: composition, size guide, country of dispatch. On materials, keep your wardrobe benchmarks — organic cotton, wool and linen wear and age differently from a blend where synthetics dominate. A glance at the label before you check out will save you the itchy jumper and the dress that doesn't breathe.

Returns are the real grey area

This is where the feed gets blurry. When you buy via a link or an online shop, the seller isn't always the retailer you think you're dealing with: official store, reseller or third-party seller? The returns address can be at the other end of Europe, and the cost may still fall to you. With distance selling, cancellation rights need checking case by case: you still need to know who to send the parcel back to, and by when.

So the advice is short: open the returns tab before you open your wallet. Check who is selling, where returns go and what they cost. Take a screenshot, pay with a traceable method, and leave the label on until you've tried everything on. We all know the parcel that sits in the hall for three weeks because we never found the right returns link — best avoid that one.

What to budget

At the affordable end of the high street, expect roughly £8 to £20 for a cotton T-shirt, £25 to £60 for a dress depending on cut and fabric, £30 to £70 for knitwear, and more like £60 to £150 for a coat. What changes the figure: the material (real wool doesn't cost the same as a blend), the retailer, the city, and the difference between a real reduction and a purely decorative one.

Where to buy? The retailer's official site, the shop, or an online store — but in the last case, with the checks above. And don't forget the alternative that costs nothing: look at what you already own, dust off last year's coat, or try second-hand. Sometimes the best Black Friday purchase is the one you don't check out.

Before you pay through an online shop: who is selling? (official store or third party) — where does the return go, and at what cost? — is the total, including delivery, really lower than on the retailer's own site? — are the composition and size guide clear? Four clear answers, one basket you can trust.

The feed is fast, and your judgement can be too — as long as you keep two habits: the screenshot and the detour via the brand's own site. The rest is pleasure: a lovely piece that fits well and gets worn more than three times is worth all the countdown timers in the world. And if the basket gets away from you at 11.47pm, remember it will open again tomorrow.