Is a Comment Legit or Spam?

I'm a new WP blogger. Sometimes I cannot tell if a comment is spam or legit. Same with respect to trackbacks

First Comment: The author field = Domain Names: Federal Court or UDRP Arbitration? | KEYTLaw « Blogging. Email field is blank. URL field = http://eamico.com/?p=36006. Text of the comment = [...] Read more here: Domain Names: Federal Court or UDRP Arbitration? | KEYTLaw [...]

The comment is for a post located here:

http://www.keytlaw.com/blog/2009/10/cybersquatting/

What is this? Is it legit? Should I delete or approve it?

Second Comment: The author name field = Twitted by azattorney. Email field is blank. The URL field = http://realurl.org/twitted.php?id=4736217813. Text = [...] This post was Twitted by azattorney [...]

FYI. My Twitter account is azattorney. All of my blog headlines are posted automatically to that Twitter account by a plugin.

The comment is for the same post referred to in question 1 above.

What is this? Is it legit? Should I delete or approve it?