Capitol Hill's early reviews for Mark Zuckerberg

What they’re saying:

• “I thought he was personable and I get the sense that he gets it,” said Senate Commerce Committee Chairman John Thune (R). “I think he realizes that they’ve got a lot of explaining to do and I think he’s anxious to take it head on.”
• Thune said that lawmakers were weighing regulation — noting at one point that Europe is about to implement strict new privacy rules — but indicated they were still gathering information.
• Thune's Democratic counterpart, Sen. Bill Nelson, said at a press conference that Zuckerberg had struck him as “forthright.”
• “But I think particularly the message that I wanted to convey to him [was] that if we don’t rein in the misuse of social media, none of us are going to have any privacy anymore,” Nelson said.

Others were more tight-lipped about their meetings. Senate Judiciary Committee Chairman Chuck Grassley (R) said the purpose of the meeting was “just to go over the process" with the Facebook CEO.

What’s next: Zuckerberg goes before a joint Senate Commerce and Judiciary hearing on Tuesday afternoon, and the House Energy and Commerce Committee on Wednesday morning.