Malaysia goes to the polls on Sunday, with one category of voters likely to play kingmakers in the outcome. Youth, that's people under 40, make up 42 percent of the electorate. It is no surprise the ruling and opposition parties are trying their best to win them over. And because social media is such a popular form of communication among the young, the campaign is also being fought on the internet. Al Jazeera's Florence Looi reports from Kuala Lumpur.