Information technology is covered in several resources including:

• eMarketer
• Forrester
• IDC
• BCC Research - relevant reports can be found within the Information Technology, Semiconductors, and Nanotechnology sectors
• MarketResearch.com Academic - Mind Commerce Publishing reports covers the IT sector 
• Mintel - includes FinTech coverage
• Statista - provides access to charts, graphs, and other statistics in this space
• Passport GMID - try a keyword search for social networking

Check out the research and thought leadership from the Interactive Advertising Bureau:
IAB Internet Advertising Revenue Report - conducted by PricewaterhouseCoopers (PWC).

Also, see websites like:

• ClickZ
• U.S. Census Bureau's E-Stats - devoted to measuring the electronic economy
• Internet Retailer