I have received a mail from LinkedIn for Invitation to Advertise on LinkedIn:
Target professionals by job, industry, company, age, or location. Get started with your LinkedIn account and this USD $50 in free advertising.
Enter the following code along with your billing information: Sorry code removed
Offer Expiration: You must create your LinkedIn Ads account before the expiration deadline of 11:59 p.m. GMT on 1 March, 2012LinkedIn Ads customers are subject to a one-time USD $5 activation fee.You are responsible for all charges in excess of the promotional credit. (Control how much you spend by setting a daily budget and ending date for your campaign. You can turn off your ads and campaigns at any time.)English is currently the only supported language for advertisements.This promotional offer is only valid for new LinkedIn Ads customers. One promotional offer per LinkedIn member. This promotional offer can only be used once, may be forwarded to another LinkedIn member, but cannot be sold or bartered. Promotional credit will be applied during the creation of a new Ads account, when you enter your billing information. All Ads are subject to the LinkedIn Ads Agreement and the LinkedIn User Agreement. This offer may be revoked at any time for any reason by LinkedIn prior to your creation of an Ads account and entering the voucher code by you. All prices are in US dollars. Please be aware that your bank and/or credit card company may charge you a currency conversion fee. Please check with your banking institution for any fees you may incur prior to placing your order as we are not responsible for any additional fees charged to you by any third party.