Zuckerberg has gotten rich, but he hasn't gotten very smart (funny how that happens a lot). Zuckerberg has no influence or power and the people in DC will stop listening to anything he has to say the minute his donations stop. The kid has no business in Washington; he's being played and will be undone for it.
He is already losing, acting like a submissive puppy, showing them greater 'respect' than he shows his investors or employees. Believe me, those lawmakers noticed and they'll have commented on it amongst themselves: "I made Zuckerberg my bitch, Bitch!" They'll suck him dry and roll his corpse down the Capitol Steps.
Look at Bill Gates, he stayed away from politics until he was old enough and powerful enough to understand how it worked and have all the advantages. Lawmakers and heads of State schedule time with Gates, not the other way around.
Zuckerberg should go home now. Take his money and do what every kid dreams of doing with nearly unlimited money. There's nothing for him to gain in DC, only lose.
Have a beer Zuckerberg, if won't hurt as bad if you get drunk and loosen up first.