How to get some free virtual currency ?

Very very easy. It's for free, in fact you get lindens just by playing games online. Games like rock, paper scissors, you also pick money off a tree. metaRL is a portal for everyone who visits virtual worlds. You can participate in games, surveys, tasks, and contests and earn virtual world currency. You earn points by playing games online points and these points can be converted and transferred to online virtual worlds. You request payouts be sent to your account in SecondLife.