Tonight's Party Election Broadcast stars members of the public that have signed up as supporters of the Liberal Democrats through Facebook.
The party has seen a huge surge in support on social networking sites since the start of the election campaign.
Nick Clegg now has more than 50,000 fans on Facebook, up from little over 13,000 before the first debate. His followers on Twitter have more than doubled, from just under 14,000 to more than 30,000, since the first debate.
The party's official Facebook page has nearly 75,000 fans, an increase of more than 300% since the first debate.
An independent Facebook group, We got Rage Against the Machine to #1, we can get the Lib Dems into office!, has nearly 160,000 members.
Speaking in the broadcast, Nick Clegg said:
"Something exciting is happening. People are beginning to believe, beginning to hope they can do something different this time.
"Of course there are people who will try to block change. Of course there are people who are spreading fear to stop the change that you want.
"I think they're wrong. I think if we do things differently we can have the fair country you want.
"You can have a better life. We don't simply need to choose from the old choices of the past.
"We don't need to repeat the mistakes of the past.
"Don't let anyone tell you it can't be different this time. It can."
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