Facebook, Inc. (NASDAQ: FB) has established itself as the leading social media giant with a market capitalization of $418.18 billion as of October 29, 2018. When Facebook issued its initial public offering (IPO) on May 18, 2012, many mutual funds had already snapped up shares on the private market. Thereafter, these funds spread their shares of Facebook across many funds. Although Facebook's stock price has gone on a roller coaster ride, those funds that held on to shares benefited from its high growth rate. It is important to note that these funds have ownership of the Facebook Class A shares, and not the Facebook Class B shares that carry heavier voting rights.

In March of 2018, Facebook stock saw huge dips on the news that millions of users' personal data had been harvested for political purposes by Cambridge Analytica, a political data and strategy firm. News of repeated privacy breaches have made investors abandon Facebook in droves. On July 26, 2018, Facebook shares dropped 19% after the company revealed it will slow growth in the near future.

Here are the three mutual funds with the most Facebook stock in their portfolios. Together, they own 5.34% of the social media giant.

Vanguard Total Stock Market Index (VTSMX)

The Vanguard Total Stock Market Index was launched in April 1992. Since then, the fund's assets have grown to $756.6 billion, and it invests primarily in U.S. large and giant cap stocks. The fund's portfolio of 3,680 holdings has 20.1% allocated to the technology sector, 19.1% to financial services and 13.6% to healthcare. The top 10 holdings have 18.7% allocation and include highly reputable companies such as Apple, Inc., Microsoft, Amazon.com and Johnson & Johnson. As of October 2018, Facebook accounts for 1.33% of the fund's portfolio and is its fifth-largest holding. The fund's 61.3 million Facebook shares give it a 2.12% stake in the company.

VTSMX has generated a three-year annualized return of 10.57% as of October 2018. Its annual expense ratio stands at 0.14%. VTSMX is most appropriate for investors looking for very broad diversification and exposure to major U.S. corporations at a low expense ratio, and with emphasis on technology and the financial services sectors.

Fidelity Contrafund (FCNTX)

Launched by Fidelity in May 1967, the Fidelity Contrafund seeks to provide capital appreciation by normally investing in common stocks with growth characteristics and/or value characteristics. The fund invests 27.35% of its holdings in the technology sector, 12.53% in consumer discretionary, and 14.88% in financial services. Facebook is the fund's second largest stock bet after Amazon, accounting for 6.21% of the fund's portfolio as of October 2018. The fund has the second highest amount of Facebook shares, with over 47.8 million to its name. 

The Fidelity Contrafund has a 10-year annual average return of 13.31% as of October 2018. The fund carries a low-to-moderate degree of risk, but it has the potential to generate high returns. It charges a net expense ratio of 0.74%.

Vanguard 500 Index Fund Investor Shares (VFINX)

The Vanguard 500 Index Fund Investor Shares implements an indexing strategy and invests nearly all of its total assets in stocks included in the S&P 500, with approximately the same proportions as the weightings in the index. The fund allocates about 21% of its assets to the information technology sector, with 15.1% to the healthcare sector and 13.3% to financial services. As of October 2018, the fund owns 44.9 million shares, or 1.56% of the company, making it the third-largest mutual fund holder of Facebook. VFINX's Facebook bet accounts for 1.6% of the fund's total assets, and is its sixth-largest holding in its portfolio. 

VFINX has a three-year annualized return of 10.79% as of October 2018. The fund is managed by the Vanguard Equity Investment Group and charges an annual expense ratio of 0.14%.