You may get in trouble with the social networking sites if you syndicate all their content. Will probably get away with posting limited RSS headlines, however, that won’t solve the problem that most corporate networks block social media.
Most RSS comes via HTTP, plus many businesses use RSS internally for updates and syndication. While some on-line RSS readers are blocked, most corporate blocking is done by domain name.
This means feeds from blocked sites aren’t likely available – Why don’t you visit some of your corporate customers, find out what they are blocking first hand?
You can also use a demographic tool to see if the cites in question get enough of the corporate traffic you are seeking. Many vendors like Infoblox, IBM, …, are posting on YouTube, so you never know until you ask.