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The new ComScore metrics for the month show Facebook had 12.5 billion ad views during the month, a 21.6 per cent market share.

Microsoft sites ranked second with 3.8 billion ad views (a 6.5 per cent share), while eBay came third with 2.9 billion ad views (4.9 per cent).

Mobile phone operators took the top two slots in the largest advertiser category, with O2 taking 1.9 per cent of the total market, and T-Mobile taking 1.3 per cent.


Top 10 online display publishers, April 2009

Property

Total Display Ad Views (MM)

Share of Displayay Ads (%)

Advertising Exposed Unique Visitors (000)

Total Internet  58,105 100.00% 35,350 Facebook.com 12,532 21.60% 21,988 Microsoft sitess 3,758 6.50% 25,433 eBay 2,868 4.90% 17,720 AOL LLC 2,494 4.30% 13,827 Yahoo! sites  2,011 3.50% 20,178 Google sites  1,056 1.80% 24,904 Fox Interactivee Media 825 1.40% 8,584 Autotrader.co.ukuk 693 1.20% 3,836 Tagged.com  438 0.80% 1,549 Amazon sites  411 0.70% 12,199

Top 10 UK online display advertisers, April 2009

Property	Total Display Ad Views (000)	Share of Publisher ad viewssher Ad Views (%)	Advertising Exposed Unique Visitors (000)
Total Internet	58,104,615	100.00%	35,350
Telefonica O2	1,128,236	1.90%	29,231
T-Mobile	750,459	1.30%	28,715
Oneweek.co.ukk	610,255	1.10%	25,150
Royal Mail Groupup	575,444	1.00%	12,190
Orange Sites	557,593	1.00%	26,483
Virgin Media	545,004	0.90%	26,984
Sky Sites	526,904	0.90%	25,849
British Telecommmunications	394,958	0.70%	24,221
Microsoft sitess	379,732	0.70%	22,020
Camelot Groupp	321,979	0.60%	19,635