Traffic Travis : How to check backlinks?

Hi, from various web backlink checkers,
It says that i have about 300 backlinks.

my domain is karaokesingsing dot com

but from traffic travis, from 'serach engline tool' under backlinks to site tab,
it only shows 8 backlinks including two of mine.

i went to google search, and searched for
link:karaokesingsing dot com and it only shows 8 sites there.

whats going on?

I have facebook, twitter, youtube, and all that created for the site, and none of em are showing as a backlink.

any help?