Why do you think that a company should take LTD for their domain? Even if they are in the tech sector? Try to think more abstract, and understand that sometimes creative brands worth more and are more interesting for users than just simple, plain names.
Let's get back to Facebook and Twitter... If Facebook was "TheElectronicChatPage.net" and Twitter "ShortMessageService.info", would you use and remember them? I doubt this...
From their site I understand that they are creating a raw data sharing service that allows people to share, use and analyze multiple data sources for investigations, researches or scientific works.
I've already worked with such a service, even if it was a state funded one. In my country there is platform where all governmental agencies upload raw data from their databases. Journalists and even simple population love this platform because they can find who won the state tenders or how many tenders a company won in the last years, how many companies a person has founded, etc.
I have already told this, information is the most valuable asset in the present, so being able to analyze raw data from different sources allows a person to make decisions and win.