I can see:
Buy, share or gift miles
Share your miles this week and give up to 100% more
Share miles with family and friends April 7 - 13, 2014, and you’ll give up to a 100% bonus – up to 50,000 more miles. The more you share, the more you give. ...
And i do see there bonus - starts from 10K shared:
[50,000 + 50,000 Bonus [v] ] [$500]
Offer available for share transactions made between April 7th 00:00:01 PT and April 13th 2014, 23:59:59 PT. All transactions are non-refundable. Bonus miles will be awarded upon completion of the transaction. The maximum number Share Bonus miles that can be received by one member for this offer is 50,000 bonus miles. All miles shared beyond this limit will not be eligible for a bonus. The recipient of the share transaction will also receive the bonus miles. All transaction inquiries must be submitted to US Airways Dividend Miles within 90 days from end of promotion. Offer is subject to change. Offer cannot be combined with any other offer. Buy and Gift transactions are not eligible for bonus. Only share transactions made online are eligible for the bonus. Please note that Dividend Miles accounts less than 12 days old are not permitted to Buy, Share or Gift miles. For Gift and Share transactions, the recipient account must also be 12 days old. All US Airways Dividend Miles terms and conditions apply.
...