The biggest change in the retirement plan would require new employees to pay 4.4 percent of their salaries toward retirement benefits.

Bain & Co, Twitter and LinkedIn are all great places to work, according to their employees, because they offer challenging work, an opportunity to work with highly talented folks and the chance to change the world.

The university's researchers said 20 percent of those responding to their survey said the PPACA will lead to fewer hires overall, while 10 percent indicated they may lay off workers in response to the law.