Top ad carriers in December 2008

Rank	Property	Unique Visitors (000)	Reach %
	Total Internet	190,650	100%
1	Platform-A	173,804	91%
2	Yahoo! Network	165,879	87%
3	ValueClick Networks	159,420	84%
4	Google Ad Network	157,131	82%
5	Specific Media	153,079	80%
6	Traffic Marketplace	147,024	77%
7	Yahoo! Sites	145,708	76%
8	24/7 Real Media	142,448	75%
9	Adconion Media Group	142,133	75%
10	Google	141,044	74%
11	Tribal Fusion	139,778	73%
12	Tremor Media	137,407	72%
13	interCLICK	137,076	72%
14	Casale Media – MediaNet	136,806	72%
15	Collective Network	126,294	66%
16	Revenue Science	126,261	66%
17	DRIVEpm	126,158	66%
18	Turn, Inc	123,150	65%
19	CPX Interactive	118,305	62%
20	ADSDAQ by ContextWeb	117,025	61%
21	BrightRoll Video Network	114,333	60%
22	Burst Media	112,601	59%
23	MSN-Windows Live	112,223	59%
24	AOL Media Network	109,879	58%
25	AdBrite	87,826	46%
26	YOUTUBE.COM	81,926	43%
27	Centro – Potential Reach	79,294	42%
28	Undertone Networks	79,259	42%
29	Vibrant Media	78,370	41%
30	MYSPACE.COM	75,909	40%
31	Ask Network	73,267	38%
32	NNN Total Newspapers: U.S.	72,178	38%
33	IAC Ad Solutions	69,839	37%
34	Gorilla Nation Media	69,676	37%
35	EBAY.COM	62,738	33%
36	Kontera	62,340	33%
37	AMAZON.COM	62,081	33%
38	Glam Media	61,129	32%
39	Pulse 360	60,834	32%
40	ITN Digital Networks	60,060	32%
41	MSN.COM Home Page	56,543	30%
42	TattoMedia	56,284	30%
43	FACEBOOK.COM	54,552	29%
44	IB Local Network	53,461	28%
45	NNN Top 25	49,520	26%
46	Adify	48,974	26%
47	Business.com Network	47,695	25%
48	WALMART.COM	46,049	24%
49	YuMe Video Network	45,860	24%
50	QuadrantONE	44,940	24%
Source: comScore