Top 50 US ad carriers in October 2008

Rank	Property	Audience, 000	Reach
1	Platform-A	173,713	91%
2	Yahoo! Network	164,080	86%
3	Google Ad Network	158,928	83%
4	ValueClick Networks	155,356	82%
5	Specific Media	150,176	79%
6	Tribal Fusion	144,354	76%
7	Yahoo!	143,089	75%
8	Traffic Marketplace	140,302	74%
9	Google	138,767	73%
10	24/7 Real Media	135,528	71%
11	Tremor Media – Potential Reach	135,222	71%
12	Casale Media – MediaNet	135,054	71%
13	Adconion Media Group	130,650	69%
14	YuMe Video Network	130,247	68%
15	interCLICK	129,477	68%
16	Revenue Science	127,186	67%
17	DRIVEpm	123,594	65%
18	Turn, Inc	117,016	61%
19	CPX Interactive	116,817	61%
20	Collective Media	113,336	59%
21	ADSDAQ by ContextWeb	113,320	59%
22	AOL Media Network	111,259	58%
23	MSN-Windows Live	110,615	58%
24	Burst Media	105,962	56%
25	AdBrite	90,165	47%
26	YOUTUBE.COM	80,877	42%
27	Centro – Potential Reach	80,225	42%
28	MYSPACE.COM*	76,257	40%
29	Vibrant Media	76,000	40%
30	NNN Total Newspapers: U.S.	74,797	39%
31	Undertone Networks	74,641	39%
32	Ask Network	70,449	37%
33	Gorilla Nation Media	68,483	36%
34	Kontera	64,468	34%
35	IAC Ad Solutions	64,422	34%
36	Pulse 360	60,430	32%
37	MSN.COM Home Page	57,617	30%
38	Ybrant – Oridian – ADdynamix	56,291	30%
39	EBAY.COM	55,436	29%
40	IB Local Network	54,747	29%
41	NNN Top 25	52,482	28%
42	TattoMedia	51,659	27%
43	ITN Digital Networks	51,633	27%
44	AMAZON.COM	49,102	26%
45	Business.com Network	47,322	25%
46	Intergi – Potential Reach	46,861	25%
47	QuadrantONE	46,233	24%
48	MapQuest	46,049	24%
49	FACEBOOK.COM	45,954	24%
50	AdOn Network	44,095	23%
Source: comScore