While this seems like something right out of those chain forward emails where Bill Gates was tracking the email and would give you a share of his fortune, it's not — Google wants you to use Google Wallet more to send cash to your friends, and they're willing to put their money where their mouth (and your wallet) is. So from now until either 20,000 referrals are sent or November 30th his, Google will give you $5 in credit for each time you send money with Google Wallet along with an invitation to a new user (up to 20 times, and "even a penny works").
There are of course stipulations on all of this, but the gist is that there's free money on the table. $100,000 in free money, and up to $100 of it can be yours. Check out the full details at the source link below, and let us know how it works for you.
Source: Google Wallet