But with no apparent censorship or restrictions to the stories that can be posted, users can potentially turn the site into a graffiti wall.

FORBES: Connect

However, on the walls of one of the buildings an alien grins and profound graffiti covers the wall in a splash of color.

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There is graffiti on one wall which reads Israel Rules.

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In the week prior to his visit, he said, at least two young people were arrested, under the Emergency Law, for writing anti-Mubarak graffiti on a wall, and spent a couple of days in prison.

NEWYORKER: The Contenders

Just like we don't put up armed guards to protect every city wall from graffiti, we should not overreact in cyberspace.

WSJ: Battling the Cyber Warmongers

Because pieces of wall with graffiti are like chunks of gold.

CNN: How I brought down the Berlin Wall

One Republican with close ties to the Bush White House, who has been at the White House "a couple of times, " told CNN that there was "trash everywhere, " that some phone lines were cut and there was graffiti on at least one wall.

CNN: Clinton aide denies reports of White House vandalism

In another case of social media consequences in Montreal, a woman was arrested earlier this month after she posted a photo on Instagram of graffiti she spotted on a city wall that depicted a high-ranking Montreal police officer with a bullet hole in his head.

CNN: When oversharing online can get you arrested

Gang graffiti and newly painted PRI propaganda competed for wall space.

NEWYORKER: The Kingpins

And make sure the wall has a colorful piece of graffiti.

CNN: How I brought down the Berlin Wall

Now, would you let a graffiti artist come and paint a faith message on your wall?

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Elsewhere people are snacking at a currywurst (curried sausage) stand while graffiti artists are putting their rebellious stamp on the Berlin Wall.

BBC: Bringing the Berlin Wall back to life

Spanning 1.3 km, this is the longest stretch of the Berlin Wall still standing and it is covered in graffiti and murals painted in the euphoric aftermath of Berlin's unification.

CNN: Berlin: What to see

Many of the surrounding walls, which are brightly decorated with graffiti art, are the product of locally-organised painting sessions known as the Wall Project, which get people together with spray cans and paintbrushes to beautify their surroundings.

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The owner of this particular wall, which is also a favored spot for other L.A. street artists, whitewashes the graffiti away every so often...

CNN: Message on a wall