Starbucks just passed the 20 million fan mark on Facebook.

The Seattle-based coffee chain ranks as the fourth-most liked brand on the site. Facebook ranks first, followed by YouTube and Coke. The Facebook Marketing Solutions page says that Starbucks regularly updates its page and rewards fans with special offers.

An application on Starbucks’ page lets fans manage the stored value cards used for pre-paid purchases at stores, and sells them as gifts — the cards alone boast 48,786 “ikes as of this writing.

Starbucks also maintains a separate page for its Frappucino and Tazo Tea brands plus the Seattle’s Best Coffee subsidiary.

What are your favorite brands on Facebook?