If I would like to identify a font type accurately, what kind of tool or sites that you used ?
whathtefont.com is a good one.
Yeh +1 for both. WhatFont does the trick for anything rendered via html/CSS, whatthefont is great for digging out typefaces used within images.
Whilst your at it install ColorZilla - great hex colour picker for chrome. So handy.
There is also WhatFontIs.