I admit I haven't seen every single post on the blog, but all of the ones I did read already had the alleged racist's full name attached.
TFS claims the blogger was "uncovering" the poster's real name, implying that he/she was doing some kind of sleuthing to find the individual behind a pseudonym. This is not the case. The blogger is merely aggregating Facebook and Twitter posts that he/she deems racist.
Anyone could do a cursory search of twitter for racial epithets and get basically the same results. I really don't see how there are legal implications for the blogger.