One reaction on social media to President Obama’s re-election can be summed up by the popular meme at right.

(You’ve probably seen the president’s celebratory “Four More Years” photo everywhere on Facebook and Twitter. With more than four million “Likes,” it’s Facebook’s most-Liked photo ever. It’s been re-tweeted more than 790,000 times, the most RTs ever.)

Of course, President Obama was a social media star even before he was re-elected, and he’ll probably continue to generate a flood of Likes and RTs through the rest of his term. The Oxford Internet Institute found that the president would have defeated Mitt Romney handily if the election had been based on Twitter references. And on Thursday, the word “Obama” had been used in more than one million Tweets, according to the social search website Topsy.  Also trending Thursday on Twitter in the U.S. – “Karl Rove” and “GOP.” But not really in a good way.

But since the election, another term that’s probably more of a concern to the president has started to make its way onto social media:

“Fiscal cliff.“

It’s a reference to the government’s possible economic implosion at the end of the year, and it has been used nearly 63,000 times on Twitter in the last day or so. Several of the references have come from news organizations and conservative pundits in reference to yesterday’s stock market tumble. But if you search for “Obama” on Twitter right now, you’ll also see Tweets like these:

How long before someone draws a political cartoon of Obama & Boehner driving in a convertible towards a cliff a la Thelma & Louise? #america

— ajk (@mister_kehl) November 8, 2012

In all seriousness, yay for Obama but that fiscal cliff needs resolution in days, not weeks or months. Lame duck nothin, America needs it

— Chike Amajoyi (@Chike43) November 8, 2012

The impact of social media on politics and government is still a matter of debate, but a healthy percentage of Americans are expressing their opinions there, to be sure. According to numbers from the Census and the Pew Internet and American Life Project, about 131 million American adults use social media. Trends show that those numbers most likely will continue to grow.

As of 9 a.m. PT today, more than 61 million votes cast Tuesday had been counted for President Obama. He received 69 million votes in 2008.

Based on what’s being said right now on Twitter and Facebook, President Obama most likely can rest assured that the social media constituency has his back. At least until “fiscal cliff” passes “Justin Bieber” in searches….