If you people only knew how much embedded ad images, css, and javascript there is in a conventional web page you'd faint. Not only from file size and data usage perspective, a lot of these have to be downloaded from various sites other than the one you're on - making the site much slower to load due to having to resolve each address and any associated latency. Sites with a lot of images also take a lot of data. The images themselves are usually very resolute and scaled down to size for display. It adds up, so it pays to not automatically display images on social media, etc.
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