北美IT公司大致分档（from mitbbs.com)

第一档:

Uber, Snapchat, Airbnb, Dropbox, Pinterest

第二档：

Facebook, LinkedIn, Google, Twitter, Apple

第三档:

Square, Yelp, Netflix, Skype, VMWare, Salesforce, Groupon, Paypal , Evernote, Box.net, Quora, A9.com, 126Lab, Zynga, Palantir

第四档:

Oracle, EMC, eBay, Intuit, NetApp, NetSuite, Yahoo, Adobe, Autodesk, Symantec, Riverbed, Quantcast, Concur, Aster Data, Citrix, EA等