Here's a ranked listing of Fonts.com Web Fonts' top 100 most used Web fonts for January 2013:

Neue Helvetica

Helvetica

Avenir

Gill Sans

Trade Gothic

Univers

Futura

DIN Next

Neue Frutiger

Avenir Next

Frutiger

Linotype Univers

ITC Avant Garde Gothic

Optima

PMN Caecilia

Trade Gothic Next

Century Gothic

News Gothic

Arial

Monotype News Gothic

Neo Sans

Agilita

DIN 1451

ITC Franklin Gothic

Linotype Didot

Rockwell

Univers Next

New Century Schoolbook

ITC Lubalin Graph

Soho

ITC Garamond

ITC Conduit

Neue Haas Grotesk

News Gothic No.2

ITC Century

Abadi

Adelle

Frutiger Next

Eurostile LT

Sabon

VAG Rounded

ITC Officina Sans

Calibri

Soho Gothic

Twentieth Century

ITC Fenice

Trade Gothic Next Soft Rounded

Garamond 3

Laurentian

Harmonia Sans

Neue Helvetica Arabic

Gill Sans Infant

Bauer Bodoni

Neue Helvetica eText

Sackers Gothic

Candara

Frutiger Serif

Eurostile Next

MSung

Biome

Palatino

Sassoon Sans

Slate

Yakout

Novecento

ITC Officina Serif

Times

Museo Slab

Clarendon

Klint

Helvetica World

Cachet

Bembo

Futura T

ITC Franklin

ITC Bodoni Seventytwo

Compatil Text

ITC American Typewriter

Albany

Georgia Pro

Rotis II Sans

Serifa

Monotype Garamond

Baskerville

Plantin

ITC Stone Sans

Glypha

Museo Sans

Neuzeit Office

ITC New Baskerville

Gazette

Heisei Kaku Gothic

Iridium

Memphis

Akko

Corporate S

Mitra

CHei2

Egyptian Slate

Basic Commercial

Ryan Arruda is the Web Content Strategist at Monotype Imaging. Ryan holds a bachelor's degree in film studies from Clark University, and an MFA in graphic design from RISD.