The hashtag #JeSuisBruxelles also began trending, a message of solidarity reminiscent of the outpouring of grief following the Charlie Hebdo attack in France last year, when the hashtag #JeSuisCharlie was created.
Christian Gaillard explains why e-mail is dying: "With e-mail usage up more than 22 percent for users aged 55 and older, younger segments of consumers are trending towards instant messaging, social media and entertainment.
Some of the big features are that it allows you to create groups out of the users you follow, gives you insights into why certain topics are trending, and threads direct message conversations.
The Romney campaign's purchase of the #BelieveInAmerica trending topic sends the message that Romney isn't interested in seeming transparent -- we already knew this from the tax return debate.
On Wednesday morning, #IStandWithHarry was trending on Twitter as messages of support flooded in.
The updated version of the mobile site, says Patel, should feel just like a native app and gives users access to all the standard Twitter features, including @mentions in the Connect tab, direct messages and trending stories in the Discover tab.
The hashtag #JeSuisCharlie, or #IAmCharlie, began trending on Twitter as a message of solidarity.
By Wednesday, #BrusselsAlive was also trending, with many posting defiant messages and images.
So if you place stock in historical trends, the message is clear: act now.
BBC Trending sent messages to the accounts involved.
Bill Geist Has a Special 'Eye' for the Outre : Entrepreneurs: Red-haired TV host and author, an astute observer of business trends, spreads message that there is wisdom in the weird.
