Maybe it's because Mark Zuckerberg knows something about getting started young. Facebook tops the list of the country's best companies for internships. That's acccording to online career site Glassdoor, which combed through thousands of company reviews shared by interns to reveal its annual ranking of the 25 Highest-Rated Companies Hiring Interns.

This year, Facebook tops the list, knocking down Google to No. 2 and out of the top spot it held the past two years. Reviews shared by Facebook interns revealed the benefits of interning for the social network include a company culture that embraces creativity and innovation, feeling valued by full-time employees, working with smart colleagues on projects that affect more than a billion people, and perks like free food and on-site laundry.

Several companies are making their debut in the rankings this year — including ExxonMobil, Yahoo and Goldman Sachs — while Microsoft, Procter & Gamble and Nordstrom make it for the third year in a row. [From NASA to the Vatican: 10 Amazing Internships]

Here is the full list of the top 25 companies for interns:

  1. Facebook
  2. Google
  3. Qualcomm
  4. Schlumberger
  5. Epic
  6. Intel
  7. Microsoft
  8. Bloomberg
  9. Apple
  10. ExxonMobil
  11. Johnson & Johnson
  12. Texas Instruments
  13. Morgan Stanley
  14. Yahoo
  15. Goldman Sachs
  16. Hewlett Packard
  17. Procter & Gamble
  18. Cisco
  19. Broadcom
  20. Deloitte
  21. JPMorgan Chase & Co.
  22. General Electric
  23. Quicken Loans
  24. Nordstrom
According to the study, New York, Los Angeles and the San Francisco Bay area are the three U.S. metros with the most employers hiring interns right now. New York has nearly 900 employers hiring interns right now, followed by Los Angeles, with 500; and the San Francisco Bay area, with more than 450.

Cities with the fewest employers hiring interns include Tampa, Fla.; St. Louis; and Detroit.

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