The 15 most powerful tech companies in America

2014 revenue: N/A

Number of employees: ~2,000

Uber is changing the way we think about transportation, and despite numerous controversies and setbacks, it continues to grow.

Even though Uber doesn't release revenue data, the Silicon Valley-based ride-hailing service raised close to $1 billion in July, valuing it at $50 billion. Not to mention, it has a Klout score of 85.

Plus, with phrases like "it's the Uber of [insert activity here]" permeating our vernacular, it's impossible to deny the company's influence.

2014 revenue: $4.98 billion

Number of employees: 12,500

California-based Yahoo generated more than $1 billion in new revenue in 2014 through its mobile, video, native, and social channels (aka Mavens). Yahoo now reaches 575 million mobile users, one of the largest mobile audiences globally.

Furthering its scope, Yahoo entered a partnership with Mozilla in late 2014 to use Yahoo.com as the default homepage for Firefox in the US. According to analytics site Alexa.com, Yahoo is the fifth most popular site in the world, and has a Klout score of 98 — unsurprising for an internet giant.

2014 revenue: $47.1 billion

Number of employees: 74,042

After a difficult fiscal 2014, Cisco Systems is expected to come back strong with a new CEO at the helm who's already fixing some costly mistakes. The worldwide leader in IT is expected to continue growing its emerging cloud services and security business.

The Silicon Valley company has a Klout score of 92, expectedly high considering much of the world's internet traffic runs through Cisco Systems.

2014 revenue: $17.9 billion

Number of employees: 34,600

In 2014, the California-based e-commerce giant announced it would be splitting eBay and PayPal into two companies. EBay also runs StubHub, but PayPal has been its principal source of growth since the company was bought by eBay in 2002.

Still, eBay, now in its 20th year of operation, has a huge command over online shoppers spanning 203 markets worldwide. It's powerful online, as well: The company has a Klout score of 94.

2014 revenue: $12.7 billion

Number of employees: 10,955

The pioneer of social media is now the top social commerce platform, driving more than two-thirds of mobile e-commerce traffic. Thanks to ads on the site, revenue was up 58% in 2014 for the Silicon Valley company.

This summer, Facebook’s market value topped $250 billion, making it the fastest company to reach that high so quickly.

Ultimately, Facebook has incredible influence. In August, CEO Mark Zuckerberg announced that 1 in 7 people on Earth used Facebook in a single day. Unsurprisingly, the social media giant has a high Klout score of 98.

2014 revenue: $38.23 billion

Number of employees: 132,000

Last year, Oracle impressively surpassed IBM to become the world's second-largest software vendor by sales. As the premier cloud provider, Oracle serves 400,000 clients, including every Fortune 100 company.

Oracle is determined to simplify IT and lead industry innovation. The California-based company shows some influence on social media with a Klout score of 87.

2014 revenue: $111.5 billion

Number of employees: 302,000

Hewlett-Packard isn't looking great after announcing that it will cut another 25,000 to 30,000 jobs, part of a huge multiyear layoff plan.

But being powerful isn't always about being well-liked, and the Palo Alto-based company remains a dominant corporation, especially considering that press mentions — both positive and negative — factored into our rankings. The company also rakes in a huge amount of revenue: over $100 billion last year alone.

HP fares much better in terms of social media, however, with almost a million followers on Twitter and a Klout score of 92.

2014 revenue: $55.25 billion

Number of employees: 106,700

Intel, headquartered in Santa Clara, California, is the world’s leading semiconductor chipmaker with a market cap of $140 billion. Apple has been using Intel chips for its computers since Steve Jobs announced the switch from IBM in 2005.

Last year, Intel lost billions of dollars going after its flailing mobile phone business, but now it's probable that Apple will replenish Intel’s losses by allowing it to capture half of its modem business with this year's iPhone release.

Intel's undoubtedly doing well on social media, though, and commands a high Klout score of 96. It has 4.26 million Twitter followers and over 25 million fans on Facebook.

2014 revenue: $127.1 billion

Number of employees: 178,500

In a $4.4 billion deal announced in May, Verizon acquired AOL, also taking on its subsidiary brands The Huffington Post and TechCrunch. The largest telecommunications company in the US, Verizon, headquartered in New York City, continues to innovate and is currently building an even faster wireless network — supposedly fast enough to download a movie in 15 seconds.

Verizon's 1.6 million Twitter followers and more than 7 million likes on Facebook gives it a definite presence online, bringing its Klout score to 86.

2014 revenue: $66 billion

Number of employees: 53,600

The search giant will soon become the largest subsidiary of Alphabet Inc., a holding company Google executives announced this summer. The Silicon Valley company is consistently ranked one of the best companies to work for in America, with a startup culture that's envied by many.

Google also owns YouTube, the world's largest video-sharing website. Google's Klout score is 98, unsurprisingly high for one of the world's most innovative and engaging companies.

2014 revenue: $92.8 billion

Number of employees: 379,592

Though IBM struggled to remain relevant against falling profits last year, the technology and consulting company retains a strong base of loyal customers and powerful partners, including major corporations such as Apple and Citigroup.

IBM is also getting into the Internet of Things — a smart move, considering it's expected to become a $1.7 trillion market within the next five years, which would only increase the Armonk, New York-based company's already-high revenue.

IBM falls behind on social media, though, with no Klout score available.

2014 revenue: $182.9 billion

Number of employees: 92,600

Easily one of most recognizable names in tech, Cupertino, California-based Apple continues to blow us away with new innovations. The big release of the year was the Apple Watch, but the company also announced more new features on the way, including additional Apple Watch styles as well as iPad and iPhone upgrades.

We used the Klout score for Apple Music in our ranking, a seemingly low 84 out of 100. But it's important to note that Apple's lack of a true score stems from the fact the the tech giant doesn't have a central Twitter account.

But Apple Music commands 7.73 million Twitter followers and the App Store has 4.09 million — certainly nothing to sneeze at.

2014 revenue: $131.6 billion

Number of employees: 250,730

The Dallas, Texas-based mobile phone service provider is now also the largest pay-TV provider in the US thanks to a recent$48.5 billion merger with DirecTV. AT&T's 4G LTE network covers more than 300 million people.

AT&T has a Klout score of 91 — thanks to 691,000 Twitter followers and 5.7 million Facebook likes — and is the only telecommunications company to rank onFortune’s most admired companies list.

2014 revenue: $86.83 billion

Number of employees: 118,000

Microsoft is on the upswing. Revenues are up 11% from last year, with tablet sales continuing to grow. In fact, the Surface brought in over $1 billion in sales in the fourth quarter last year, making it "respectably profitable," Business Insider reported.

It's no surprise that the Redmond, Washington-based technology company is also social media savvy, earning it a near-perfect Klout score of 99, tied with Amazon for the highest score on our list.

2014 revenue: $88.99 billion

Number of employees: 154,100

As the largest e-commerce site in the country, Amazon recently surpassed Walmart as the most valuable retailer in America in terms of market capitalization.

The Seattle-based company currently owns over 40 subsidiaries, including Zappos, IMDb, and GoodReads, and refuses to be left behind in the consumer-electronics market.

Amazon debuted an e-reader and tablet to compete with Apple and launched Amazon Instant Video, which has produced an award-winning original television series. Amazon is tied with Microsoft for the highest Klout score on our list at 99 out of 100.