All that part is just rating the different sites, it's like reviews for the sites, which tons of sites do, all using the logos and many other pictures from the sites. Always saying Source: somesite.com AND most sites in their copyright rules say it's fine as long as you use source: theirsite.com.
It's beneficial for two reasons. One, the rating will make other players that are on the social network to play that game too! So they get more players too! The free gifts help the site, because there is a chance that the user will spend it on that site.
In my opinion, they could on the site, or we could always just make a logo for the site.
Anyone else have any advice about the images (logos)?