Online surveillance: What Belgian cat tweets can teach us

While thecity of Brussels remains on lockdown, Belgians have respondedby tweeting pictures of cats.

Some have framed it asan act of defiance against terror, while others saw it as a nod to the country's connection to surrealism.

But CBC technology columnist Dan Misener saysthose Belgian felines also have something to teach us about online privacy and surveillance.

How did the Belgian cat meme start?

As of Sunday night,Brussels was on lockdown, with subways, schools, and stores closed. Authorities thereare conducting raids, searching for suspected terrorists.

• Brussels remains on highest alert level

And as part of this, Belgian police made a request to the public don't share police movements on social media. The goal was silence, toavoidsocial media posts that might interfere with the policeor tip off the suspects they were searching for.

But in response, Belgians started tweeting pictures of cats with the hashtag #BrusselsLockdown.Some saw this as a way to lighten the moodand show solidarity in a pretty scary and surreal situation.

• Belgians tweet cat pics in following orders not to reveal police action

Why are cat picturesbetter than saying nothing at all?

Finn Brunton isa professor of media, culture, and communication at New York University.He recentlyco-authored a book about theobfuscation tactic, calledObfuscation: A User's Guide for Privacy and Protest.

He argues that if everyone on Twitter had remained silentabout police movement, anyone who broke that silence would be that much louder.

"The beauty of the public response was that it recognized this as the challenge," he said. "And instead of everyone being quiet, people flooded the hashtag with this sort ofcharming and strange and basically innocuous material, such that even if someone tried to violate the ban, they wouldn't get anything out of it."

Essentially, by filling the #BrusselsLockdown hashtag with noise (in the form of cat pictures), people created a "needle in a haystack" situation for anyone trying to track police action via social media.

Brunton saidhe's seen this kind of obfuscation strategy used to flood Twitter hashtags inMexicoand Russia in the past with one significant difference.

"All of the previous examples that I have are examples of governments using [it]against their own people, trying to either stall protestsor interfere with organizing activity around elections," Bruntonsaid. "And it's fascinating to see this technique being used [by citizens] in support of their government in taking action."

How else can this strategy be used?

Obfuscation is a strategy for dealing with a situation in which you're monitored all the time, andwhere you can't avoid observation.

So you can imagine this is particularly useful in a digital context, when it comes to maintaining our online privacy.Increasingly, our online activities are tracked across devicesby online servicesand advertisers, for example.

But if an online service is tracking youall the time, you can throw it off by entering in a bunch of junk information essentially makingyourself difficult to track by hiding in plain sight.

If I want to try obfuscation myself, where do I start?

There are two pieces of software that are a good way to start thinking about obfuscation in everyday life.

The first one is called AdNauseam.It's an app designed to throw advertisers off your trail, and keep them from building up an accurate profile of you.

Basically, as you browse around the web, AdNauseam clicks on every single ad it sees. So from the perspective of an ad network, it looks like you like everything.

Another useful piece of softwareis TrackMeNot. It's a browser extension designed to keep search engines from building up a profile about you.

It generates a series of randomized search queries, so your real searches are hidden once again, basically needles in an online haystack created by the extension.

Or, of course,you could just start posting nothing but cat pictures, all the time.