Media roundup: DDB, Facebook, WPP, GMG Radio, Greggs, Adam & Eve

We bring you the buzz from the wider media sphere, across the world and across the web. This week: DDB's chief creative officer accuses WPP's Cannes judges of tactical voting; OFT launches probe into Facebook's acquisition of Instagram; Sir Martin Sorrell claims WPP leaders are "underpaid" versus three rival networks; Global Radio buys GMG Radio in 50m deal; Greggs considers loyalty card launch; Adam & Eve launches Genius print campaign.

Cannes 2012: DDB's chief creative Kassaei accuses WPP judges of tactical voting
DDB Worldwide's chief creative officer, Amir Kassaei, has lambasted some of the WPP judges at this year's Cannes Lions festival for what he believes has been tactical voting that risks damaging the credibility of the event.

OFT launches probe into Facebook's Instagram deal
The Office of Fair Trading (OFT) has launched a probe into Facebook's proposed $1bn (£641m) acquisition of photo-sharing service Instagram, to determine whether the merger will prevent photos being uploaded to rival sites such as Twitter.

Cannes 2012: Sorrell calls WPP leaders 'underpaid'
Sir Martin Sorrell has called for consistency in standards applied by City advisors, claiming all WPP executives are "underpaid" in relation to its three rival network groups, following the rejection of his £6.8m pay package by shareholders.

Global Radio seals £50m purchase of GMG Radio
Global Radio, the owner of the Heart and Capital brands, has confirmed the purchase of Guardian Media Group's GMG Radio business, owner of Real and Smooth Radio, for a sum understood to be in the region of £50m.

Greggs launches concept store and considers loyalty card
Greggs is plotting a major revamp of its stores and is also poised to introduce a loyalty card in a move to cash in on its growing popularity, following the pasty tax row.

Genius '2012 brand campaign' by Adam & Eve
Adam & Eve has launched a new print campaign for Genius to introduce its range of gluten-free products to a wider audience.