But the more people join, the more useful it becomes.
With the pressure mounting on the social network, some are speculating that Facebook may soon launch a paid-for version of the platform alongside its current free offering. Jefferies said in an April research note that the firm "analyzed Facebook's traffic over the course of March and believe that recent headlines around Facebook's data policies have not meaningfully impacted engagement on the platform". The significance of this increase is that Zuckerberg, who owns more than 401.4 million shares in Facebook, is now $3 billion richer due to his appearance with the Senate and House Energy and Commerce Committee.
One of the more pressing concerns of Congress during this second hearing was how Facebook tracks user data around the world, as well as those that have yet to even sign up to the site, dubbed "shadow profiles".
Like many others, I checked to see if my data had been shared with "This Is Your Digital Life", the personality quiz app that allowed Cambridge Analytica to harvest the data.
Wearing a dark suit and tie and politely prefacing nearly every remark with "Congressman" or "Congresswoman", Zuckerberg appeared even more controlled than he did on Tuesday when he testified before senators.
An estimated one in 50 Australian Facebook users are thought to have their data leaked. With just about everyone's online business models dependent on extensive data gathering and targeted advertising, perhaps Zuckerberg might console himself with the thought that he likely won't be the last tech executive hauled up and asked questions about this topic. Zuckerberg had said that such data is collected for "security purposes", for example to flag unauthorized users trying to log in.
In a post which asks "Does it cost money to use Facebook?".
Zuckerberg said he believes the company collects "different data for those" and would follow up with further details - a line he frequently fell back on when he didn't provide a direct answer.
Social networking giant Facebook has chose to stop funding a campaign that aims to defeat the California Consumer Privacy Act.
It will be weeks before Facebook responds to Congress and addresses this issue.
The data was improperly shared with Cambridge Analytica by an academic who gathered data on users and their friends through a questionnaire app on Facebook.
"I could use that information in order to send them ads suggesting that they could vote online - something that happened in the US presidential election - in order to discourage those people from actually going to a polling place and casting a ballot".
Flummoxed, Zuckerberg resorted to a common response. She cut Mr Zuckerberg off a number of times.