Global market holding up, but Europe is treading water. - Global advertising spending in the media will rise by 4.3% in 2012, but the European market will remain weak, according to media agencies ZenithOptimedia and Magna Global. Forecasts for the year issued in March suggested global growth of 4.8%, but lower spending in April and May due to the continuation of the euro crisis has forced the estimate down. Advertising spending in the eurozone is expected to fall by 1 .1% in 2012, with...