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Holy shit!
Since the link goes to an alert with no article behind it currently, here are a few news articles for your convenience:

Reuters: Turkey earthquake of magnitude 7.9 shakes central region, Syria
AP: Powerful 7.8 quake knocks down buildings in Turkey, Syria
Hürriyet Daily News: 7.4 magnitude quake knocks down buildings in southern Türkiye
BBC: Strong earthquake hits south-eastern Turkey near Syria border
Times of Israel: Strong quake knocks down buildings in Turkey and Syria; shaking felt across Israel >

lasted 40 seconds.  An eternity in earthquake terms >

I have a friend who was in the Northridge quake.  He actually saw the ground roll towards him, knocked him on his ass. >

I saw this happen in the Loma Prietta quake. I was playing flag football when it hit, and I watched the whole field just roll up towards me, wave after wave. It was surreal. >

I distinctly remember my middle-school Earth science teacher telling us about that, in the right conditions you can see the actual shockwave rollin up on you >

They don't call it soil liquefaction for nothing. >

Japan  earthquake March 11, 2011 Liquefaction >

That video was crazy. Even crazier when played in 2x speed so you can more clearly see the shifting. >

Syrian officials say that this was the biggest earthquake in the history of Syria. >

Absolutely devastating. >

I reside in Kahramanmaraş. I was about to sleep laying on my bed. İt felt like an eternity and I was pretty sure I was going to be buried under rubble. Took my cellphone on my hand in case they would find me easier. >

Are you and your family ok? >

Me and my family are OK. I'm a teacher in Kahramanmaraş and one of my colleague and his family are still under rubble. We are waiting for any help from other countries with search and rescue. >

What is the current situation in Maraş? There is insufficient info as I'm seeing, what happened after the explosion from the gas pipeline? >

Explosion happened in a village I think. We are all in the black as everyone else >

My thoughts are with you, holy smokes that must be terrifying. >

I am from Turkey. The news are saying that it impacted 10 cities, even in Malatya (which is not the center of the earthquake), there are over 140 collapsed buildings. In addition, it is currently snowing in some of these cities.
Edit (00.38 GMT-3): Correction on the total number of buildings collapsed. The vice president stated that there were 4758 confirmed collapsed buildings + they have not confirmed the status of remaining reported 1459 buildings. 14483 injured & 2379 people have lost their lives. In total, 7840 people saved from the rubbles up until this point.
Edit (23.25 GMT-3): 6217 buildings collapsed & 13293 injured & 2316 people have lost their lives.
Edit (22.55 GMT-3): 5606 buildings collapsed & 12068 injured & 1762 people have lost their lives. Appreciating all the international aid, wishes, and prayers. We were definitely not prepared for this disaster. Still, there are some locations that have not received any help (especially in Hatay), local people are trying to extract their loved ones from rubbles themselves.
Edit (18.50 GMT-3): 3471 buildings collapsed & 9733 injured & 1541 people have lost their lives. It is now dark in the area, and extremely cold.
Edit (13.42 GMT-3): Just had an afterschock with 7.5 (revised as 7.6) magnitude (Kahramanmaraş). Reporters are saying that more buildings have collapsed. I have no words, we are in absolute shock.
Edit (13.09 GMT-3) - Latest official numbers according to Erdoğan's statement: 2818 buildings collapsed & 5385 injured & 912 people have lost their lives, 2470 people were saved from the debris. Again, especially with the updated number of collapsed buildings, we can expect much higher numbers of casualties.
Edit (10.17 GMT-3): According to the first statement of vice president , 1710 buildings collapsed & 2323 injured & 284 people have lost their lives. Unfortunately, these numbers will seem to exponentially increase over time.
Edit (09.50 GMT-3) - after initial reports:
Diyarbakır - 7 buildings collapsed
Şanlıurfa - 19 buildings collapsed
Adana - 6 buildings collapsed (two of them have 14 and 17 floors, all occupied)
Osmaniye - 65 buildings collapsed
Gaziantep - 531 buildings collapsed (including historical Gaziantep Castle)
Malatya - 140 buildings collapsed
Adıyaman - 100 buildings colllapsed
We haven't heard from the actual center of the earthquake (Kahramanmaraş) yet. It is bad, it is really really bad. All of us are hoping for miracles and some good news. No news about Kahramanmaraş yet except horrific videos. There are also explosions/fires in the factories and natural gas lines in the area. >

There is no way those numbers are accurate right now, there is a video of Diyarbakır on Twitter and just in that 15 second video you can see at least 20-30 collapsed buildings. 
Numbers are not accurate right now, it is gonna get worse, prepare yourselves for the worst. >

The Gaziantep Castle, which has withstood over 2200 years of earthquakes and erosion is gone. Insane.
The aftermath videos from the populated areas are horrific, whole blocks are completely flattened. >

Gone? Like.. collapsed? I have a friend there and he told me it’s damaged, where did you read about it?