I'm building a site where I need to post some news (links) about a specific subject.
I'll gather them around and aggregate them on my site.
The question is:
Can I use their thumbnail to promote their own links?
For example: (from example.com):
Of course this will be pointed to the specific example.com link URL for that post and the Source: example.com will also be displayed.
I'll be getting news from many sites, not just example.com.
Is this legal? Also, how will Googlebot react to this, when it comes to pageranking?

http://popurls.com/does exactly that. So I guess it's not illegal. – cbdeveloper Feb 28 '20 at 10:15srcyourself? (asking this in the context of newspaper websites) – cbdeveloper Feb 28 '20 at 17:32