Over half a million people have already signed a petition that will be delivered to Congress. You can read the petition and sign it here.
Meanwhile, four US senators (Ron Wyden, Mark Udall, Richard Blumenthal and Rand Paul) who have been concerned about NSA overreach have joined together to propose legislation to reform the NSA’s surveillance programs. Techdirt says that the reforms are quite meaningful.
UPDATE: Here is senator Wyden’s opening remarks and questions at yesterday’s Senate hearing at which NSA director Keith Alexander testified. He was pretty good but Alexander sounded evasive so he probably parsing words to avoid telling the truth, the way that the NSA routinely does.