Observation: For mobile optimization, websites founded longer ago tend to rely more on dynamic serving. Websites founded more recently tend to utilize responsive web design CSS.

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Many websites use a mixture of both, but younger websites tend to rely on responsive web design CSS.

Poal, Voat and Phuks rely entirely on responsive web design.

Websites such as Vid8, BitChute and VlareTV also entirely use responsive web design for mobile optimisation.

For Twitter, they use a mixture of both and it is a complicated story. Their lastest website version that started as Twitter Lite in 2017-04 however uses responsive design. But dynamic serving serves the legacy mobile fallback site if it detects an old browser. (Not the legacy desktop version that will R.I.P. 20200601, but the soCalled M2 mobile web versiob).

Dynamic serving is more used by websites tha have been around for longer, including Facebook, YouTube, dict.cc, StackExchange.com, SoundCloud and Reddit (although YouTube and Faggit allow manually selcting the site through URL parameters or domain names).

I guess that is because CSS and mobile browser support used to be more limited in the 2000s, so sites founded back then have built upon dynamic serving.

Also, sites had to be lightweight (i.reddit.com) for the far smaller / less powerful RAMs, CPUs, GPUs of mobile phones back then. And Flash Player support was also a thing back then. Only a few mobile phones ever (e.g. 2011 Samsung Galaxy Wonder, 2009 Samsung GT-i8000 Omnia 2 and 2011 GT-i9100 Galaxy S2) supported that by default. Mobile sites had to be built using simple HTML with a bit support from CSS and JS instead of heavier desktop pages.

Many mobile phones back then did not even have touch screens (e.g. Nokia E71 and E72, which were actually very good devices for their time).

These days, mobile browsers use the same browsing engine as desktop browsers and can easily handle the desktop site code.

Many websites use a mixture of both, but younger websites tend to rely on responsive web design CSS. Poal, Voat and Phuks rely entirely on responsive web design. Websites such as Vid8, BitChute and VlareTV also entirely use responsive web design for mobile optimisation. For Twitter, they use a mixture of both and it is a complicated story. Their lastest website version that started as *Twitter Lite* in 2017-04 however uses responsive design. But dynamic serving serves the legacy mobile fallback site if it detects an old browser. (Not the legacy desktop version that will R.I.P. 20200601, but the soCalled *M2 mobile web* versiob). Dynamic serving is more used by websites tha have been around for longer, including Facebook, YouTube, dict.cc, StackExchange.com, SoundCloud and Reddit (although YouTube and [Faggit](/s/MeanwhileOnReddit) allow manually selcting the site through URL parameters or domain names). ---- I guess that is because CSS and mobile browser support used to be more limited in the 2000s, so sites founded back then have built upon dynamic serving. Also, sites had to be [lightweight](https://i.reddit.com/r/Poal) for the far smaller / less powerful RAMs, CPUs, GPUs of mobile phones back then. And Flash Player support was also a thing back then. Only a few mobile phones ever (e.g. 2011 Samsung Galaxy Wonder, 2009 Samsung GT-i8000 Omnia 2 and 2011 GT-i9100 Galaxy S2) supported that by default. Mobile sites had to be built using simple HTML with a bit support from CSS and JS instead of heavier desktop pages. Many mobile phones back then did not even have touch screens (e.g. Nokia E71 and E72, which were actually very good devices for their time). These days, mobile browsers use the same browsing engine as desktop browsers and can easily handle the desktop site code.

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