With Brussels on lockdown, and the terror alert raised to the maximum level of 4/4 meaning that a chance of attack is serious and imminent, twitter took over the #BrusselsLockdown hashtag amidst fears that terrorists were getting information about the police operations.

The twittersphere reacted to this possibility by flooding the social media network with tweets about cats (and dogs) in order to both confuse the terrorists, and lighten the gloomy mood that the city has been in for the la...