对Google算法调整所造成影响的研究 『转』

　搜索引擎自然搜索是大家必争的流量来源之一，站群、博客群、评论、PR等产生外链的方式多种多样。然而今年2月24号，Google.com站进行了代号为Farmer Update的算法升级，对不少站点造成了很大的影响。文章以Organic Performance Index（OPI）为参数，对一些站点做了对比。 底部有文章来源，里面还提供完整列表的下载。有什么用？你懂的。。。

懒得复制原文和图片，直接上数据了：
The biggest losers in percentage were:
Domain	OPI_today	OPI_last	Difference	%
blippr.com	11,024	529,970	-518,946	-97.9%
suite101.com	19,874	263,529	-243,655	-92.5%
tradekey.com	2,970	38,237	-35,267	-92.2%
associatedcontent.com	23,687	281,343	-257,656	-91.6%
articlesbase.com	13,492	157,958	-144,466	-91.5%
helium.com	7,170	83,184	-76,014	-91.4%
faqs.org	15,971	140,951	-124,980	-88.7%
freedownloadscenter.com	23,216	192,128	-168,912	-87.9%
mahalo.com	56,305	442,563	-386,258	-87.3%
allbusiness.com	2,694	19,995	-17,301	-86.5%
ezinearticles.com	35,691	259,516	-223,825	-86.2%
essortment.com	13,507	93,993	-80,486	-85.6%
americantowns.com	6,109	38,783	-32,674	-84.2%
findarticles.com	11,648	70,404	-58,756	-83.5%
howtodothings.com	10,605	62,372	-51,767	-83.0%
lovetoknow.com	30,289	157,037	-126,748	-80.7%
hubpages.com	122,796	618,406	-495,610	-80.1%
wisegeek.com	113,436	489,014	-375,578	-76.8%
buzzle.com	78,206	335,304	-257,098	-76.7%
doityourself.com	8,069	33,231	-25,162	-75.7%
merchantcircle.com	20,195	83,133	-62,938	-75.7%
business.com	10,961	42,877	-31,916	-74.4%
thefind.com	13,107	46,769	-33,662	-72.0%
trails.com	9,607	32,385	-22,778	-70.3%

The biggest losers in terms of absolute visibility were:
Domain	OPI_today	OPI_last	Difference	%
answerbag.com	662,274	1,673,406	-1,011,132	-60.4%
answers.com	682,274	1,673,410	-991,136	-59.2%
blippr.com	11,024	529,970	-518,946	-97.9%
hubpages.com	122,796	618,406	-495,610	-80.1%
about.com	3,199,369	3,689,144	-489,775	-13.3%
mahalo.com	56,305	442,563	-386,258	-87.3%
wisegeek.com	113,436	489,014	-375,578	-76.8%
associatedcontent.com	23,687	281,343	-257,656	-91.6%
buzzle.com	78,206	335,304	-257,098	-76.7%
suite101.com	19,874	263,529	-243,655	-92.5%
ezinearticles.com	35,691	259,516	-223,825	-86.2%
freedownloadscenter.com	23,216	192,128	-168,912	-87.9%
articlesbase.com	13,492	157,958	-144,466	-91.5%
lovetoknow.com	30,289	157,037	-126,748	-80.7%
faqs.org	15,971	140,951	-124,980	-88.7%
examiner.com	43,101	142,296	-99,195	-69.7%
essortment.com	13,507	93,993	-80,486	-85.6%
helium.com	7,170	83,184	-76,014	-91.4%
merchantcircle.com	20,195	83,133	-62,938	-75.7%
ask-leo.com	57,140	117,708	-60,568	-51.5%
findarticles.com	11,648	70,404	-58.756	-83.5%
livestrong.com	34,554	87,086	-52,532	-60.3%
howtodothings.com	10,605	62,372	-51,767	-83.0%
tradekey.com	2,970	38,237	-35,267	-92.2%

几家欢乐几家愁，也有受益的 Winner were:
Domain	OPI_today	OPI_last	Difference	%
wikihow.com	455,031	254,087	200,944	79.1%
answers.yahoo.com	524,056	406,523	117,533	28.9%
ehow.com	944,950	831,961	112,989	13.6%
howstuffworks.com	666,073	574,523	91,550	15.9%
huffingtonpost.com	1,262,562	1,173,229	89,333	7.6%
facebook.com	3,157,406	3,094,804	62,602	2.0%
instructables.com	80,142	68,685	11,457	16.7%


Google.co.uk 也开始收到Panda Update的影响
The full list of 100 losers in percentage:
domain	Visbility (OPI) new	Visibility (OPI) old	difference	loss in %
reviewcentre.com	68096	648704	-580608	-89,50%
myvouchercodes.co.uk	289948	661560	-371612	-56,17%
ciao.co.uk	20723	335697	-314974	-93,83%
dooyoo.co.uk	14654	282837	-268183	-94,82%
promotionalcodes.org.uk	31992	262717	-230725	-87,82%
about.com	543243	760583	-217340	-28,58%
brothersoft.com	90625	295898	-205273	-69,37%
everydaysale.co.uk	3822	175800	-171978	-97,83%
answers.com	142129	310111	-167982	-54,17%
pocket-lint.com	2128	165956	-163828	-98,72%
robtex.com	61832	218644	-156812	-71,72%
hubpages.com	26099	182704	-156605	-85,72%
netvouchercodes.co.uk	1935	152376	-150441	-98,73%
mahalo.com	31609	166781	-135172	-81,05%
markosweb.com	12844	136590	-123746	-90,60%
qype.co.uk	5307	126801	-121494	-95,81%
biznut.co.uk	3865	118715	-114850	-96,74%
discountvouchers.co.uk	65751	178428	-112677	-63,15%
ehow.com	93902	201781	-107879	-53,46%
wikio.co.uk	10627	114833	-104206	-90,75%
ehow.co.uk	33402	120596	-87194	-72,30%
airfaresflights.co.uk	4100	89924	-85824	-95,44%
ip-adress.com	26274	111986	-85712	-76,54%
voucherhub.com	9756	84783	-75027	-88,49%
wakoopa.com	1334	71525	-70191	-98,13%
vouchercodes.com	21481	91535	-70054	-76,53%
techradar.com	49761	116832	-67071	-57,41%
reghardware.com	6133	72206	-66073	-91,51%
discountshoppinguk.co.uk	491	66270	-65779	-99,26%
twenga.co.uk	5690	71095	-65405	-92,00%
wisegeek.com	21680	83584	-61904	-74,06%
electricpig.co.uk	1678	60882	-59204	-97,24%
whosdatedwho.com	2314	60476	-58162	-96,17%
pricedash.com	127	55141	-55014	-99,77%
cylex-uk.co.uk	2010	56744	-54734	-96,46%
webdevelopersnotes.com	583	54948	-54365	-98,94%
voucherseeker.co.uk	9086	62342	-53256	-85,43%
ezinearticles.com	3577	56704	-53127	-93,69%
savoo.co.uk	4047	56118	-52071	-92,79%
killerstartups.com	869	52717	-51848	-98,35%
fairinvestment.co.uk	43728	92214	-48486	-52,58%
justtheflight.co.uk	2500	50806	-48306	-95,08%
radioandtelly.co.uk	2539	49276	-46737	-94,85%
shopzilla.co.uk	40470	86937	-46467	-53,45%
pcadvisor.co.uk	39730	85628	-45898	-53,60%
aceshowbiz.com	907	46188	-45281	-98,04%
techwatch.co.uk	12341	56793	-44452	-78,27%
shopping.com	15402	59608	-44206	-74,16%
hotfrog.co.uk	1124	44863	-43739	-97,49%
buyyourcar.co.uk	41542	85021	-43479	-51,14%
comparestoreprices.co.uk	5658	48219	-42561	-88,27%
associatedcontent.com	2239	44158	-41919	-94,93%
worldtravelguide.net	6245	47922	-41677	-86,97%
wikio.com	1819	43194	-41375	-95,79%
softonic.com	184838	225647	-40809	-18,09%
yourdictionary.com	20625	60991	-40366	-66,18%
buzzle.com	7113	47319	-40206	-84,97%
fanpix.net	3340	43163	-39823	-92,26%
couponsnapshot.co.uk	1845	41463	-39618	-95,55%
zath.co.uk	161	39768	-39607	-99,60%
moneypage.com	25	39231	-39206	-99,94%
computing.net	11689	50721	-39032	-76,95%
just-food.com	293	39282	-38989	-99,25%
freedownloadscenter.com	6349	45040	-38691	-85,90%
voucherstar.co.uk	126	38748	-38622	-99,67%
idealo.co.uk	5846	44100	-38254	-86,74%
techeye.net	1879	38828	-36949	-95,16%
flightmapping.com	13086	47787	-34701	-72,62%
suite101.com	1658	35957	-34299	-95,39%
visit4info.com	2092	36365	-34273	-94,25%
mobileshop.com	35495	69436	-33941	-48,88%
computerweekly.com	1733	35299	-33566	-95,09%
techworld.com	1400	34923	-33523	-95,99%
themecraft.net	1163	34070	-32907	-96,59%
phonesreview.co.uk	864	33418	-32554	-97,41%
articlesbase.com	4139	36568	-32429	-88,68%
yourcounty.co.uk	5094	37145	-32051	-86,29%
broadbandgenie.co.uk	11156	43181	-32025	-74,16%
trustpilot.co.uk	3868	35230	-31362	-89,02%
shopsafe.co.uk	1064	32359	-31295	-96,71%
itproportal.com	1245	32533	-31288	-96,17%
londontown.com	10315	41456	-31141	-75,12%
njobs.org.uk	92	30693	-30601	-99,70%
aboutbritain.com	2877	33327	-30450	-91,37%
kgbanswers.co.uk	1009	31427	-30418	-96,79%
play.com	305883	336067	-30184	-8,98%
shoppingvouchers.co.uk	134	30056	-29922	-99,55%
xomba.com	4050	33916	-29866	-88,06%
squidoo.com	52450	81811	-29361	-35,89%
autopartstrader.co.uk	1162	30282	-29120	-96,16%
mydeco.com	34252	63063	-28811	-45,69%
pcwb.co.uk	3447	31890	-28443	-89,19%
hunkymalestars.com	1638	29970	-28332	-94,53%
soft82.com	8747	37062	-28315	-76,40%
passport.net	94318	122568	-28250	-23,05%
money.co.uk	25726	53588	-27862	-51,99%
reevoo.com	38253	65519	-27266	-41,62%
soccerlens.com	2216	29481	-27265	-92,48%
screenrush.co.uk	1093	27930	-26837	-96,09%
osoyou.com	96	26668	-26572	-99,64%

And now for the top 20 winners. Nothing drastic here, but some confirmation that sites where users spend a lot of time looking at pages have gained more visibility following the update.

domain	Visibility (OPI) new	Visibility (OPI) old	difference	%
ebay.co.uk	1469346	1034302	435044	42.06%
techcrunch.com	174797	124220	50577	40.72%
national-lottery.co.uk	292053	209357	82696	39.50%
econsultancy.com	186175	135804	50371	37.09%
thisismoney.co.uk	234717	180377	54340	30.13%
siteslike.com	175869	140279	35590	25.37%
mirror.co.uk	275876	220937	54939	24.87%
blogspot.com	1006719	819832	186887	22.80%
mashable.com	295137	240714	54423	22.61%
itv.com	345470	282300	63170	22.38%
metro.co.uk	181507	149271	32236	21.60%
independent.co.uk	471896	388280	83616	21.53%
mozilla.org	146282	122471	23811	19.44%
youtube.com	8856696	7446902	1409794	18.93%
vimeo.com	168979	142182	26797	18.85%
wordpress.com	331836	279738	52098	18.62%
laterooms.com	150533	127297	23236	18.25%
dailymotion.com	577590	490328	87262	17.80%
soundcloud.com	150998	128569	22429	17.45%


US  http://blog.searchmetrics.com/us/2011/03/03/google-farmer-update-whos-really-affected/
UK  http://blog.searchmetrics.com/us/2011/04/12/googles-panda-update-rolls-out-to-uk/