SuperMedia employees rated the place they work 20.7% higher than the year prior, while Unisys employees were 20.1% happier.

FORBES: The Companies With The Biggest Jumps In Employee Happiness

In the No. 2 and No. 3 spots are SuperMedia, a Dallas, Texas-based publishing and Internet company, and Unisys, a Pennsylvania-based IT firm.

FORBES: The Companies With The Biggest Jumps In Employee Happiness

Dex Media is an advertising company formed when the two main firms in the domestic yellow pages industry, SuperMedia (SPMD) and Dex One (DEXO), merged.

FORBES: What's The Story With Dex Media And Why Is It So Darn Cheap?

Some other social media companies that have seen large gains during the past year include Snap Interactive (OTC: STVI), PeopleString (OTC: PLPE), and SuperMedia (NASDAQ: SPMD).

FORBES: Is Social Media A Bubble?