Get 50 Dollar from Bing

50 Dollar one comes from here:

Proved

How To Do It

Valid only for advertisers opening a new account on the Bing advertising interface, Bing Ads prior to January 31, 2013 (midnight Pacific Time) and who have a Webmaster Tools verified site. This offer has a spend limit that is not to exceed $50 credit in search ad clicks. Any portion of the $50 ad credit not used within 90 days of redemption will expire. Advertisers will be charged for advertising that exceeds the $50 credit, even if that credit is exceeded during the first 90 days after redemption. It is the sole responsibility of the advertisers to monitor their Bing Ads accounts. Ads must be stopped after $50 ad credit is used up or within 90 days from redemption, whichever comes first, or your credit card will be charged for advertising clicks. Limit: one promotional offer per new advertiser. Offer valid only to residents of the 50 United States and Washington, D.C. The billing address in order for the coupon to be valid must be in the United States and a form of payment must be entered into your account at the time this coupon is being redeemed and prior to your account going live to take advantage of the credit. This offer may not be combined with any other offer or discount, separated, redeemed for cash, transferred, sold, or bartered. There is a minimum bid requirement of $0.05 per click through. Search listings are subject to editorial review. See Advertisers Term and Conditions for more details at sign-up. Other terms and conditions may apply.

http://www.bing.com/toolbox/webmaster