Document (#28380)

Author
Lewandowski, D.
Title
Zusammenarbeit von Google, Yahoo und Microsoft
Source
Password. 2005, H.2, S.26
Year
2005
Abstract
Im Kampf gegen die Vermüllung ihrer Trefferlisten haben sich die Konkurrenten Google, Microsoft und Yahoo darauf geeinigt, ein neues Attribut für die Verlinkung von Webseiten auszuwerten. Dies könnte ein erster Schritt zu weniger Spam und einer weiteren Zusammenarbeit dergroßen Suchmaschinen sein.
Content
"Alle drei Suchmaschinen werden künftig das neue "Nofollow"-Attribut unterstützen. Dieses kennzeichnet, dass der damit ausgezeichnete Link nicht von Suchmaschinen verfolgt werden soll. Der Hintergrund dafür ist die automatisierte Vermüllung von Gästebüchern, Foren und Weblogs. Bisher werden solche Links ebenso in das Ranking mit einberechnet wie jeder andere Link auch. Die Links sind für die Suchmaschinen von großer Bedeutung, da sie als eine Stimme für eine Seite gezählt werden, d.h. es wird angenommen, dass ein Link eine Empfehlung für diejenige Seite ist, auf die verlinkt wird. Vereinfacht bedeutet dies, dass Suchmaschinen oftverlinkte Seiten auf höheren Rangplätzen zeigen als weniger verlinkte Seiten. Diese Berechnung wird durch automatisch erzeugte Links ad absurdum geführt. Um die Anzahl der Links auf ihre Seiten zu erhöhen, greifen Spammer immer mehr Foren, Gästebücher und Weblogs an und hinterlassen in diesen Hinweise auf ihre Seiten. Mit dem neuen Attribut ist es möglich, sämtliche Links beispielsweise in einem Gästebuch so auszuzeichnen, dass sie von den Suchmaschinen nicht mehr beachtet werden. Die Nicht-Beachtung äußert sich auf mehreren Ebenen: - Die Links werden von den Suchmaschinen nicht mehr verfolgt. Dies bedeutet, dass diejenigen Seiten, auf die verlinkt wird, unter Umständen nicht mehr in den Index der Suchmaschinen aufgenommen werden. Allerdings dürfte dieser Fall in der Praxis nur selten auftauchen, da von nahezu allen Seiten angenommen werden kann, dass sie auch auf konventionelle Weise verlinkt sind. - Die entsprechend ausgezeichneten Links werden nicht in die Kalkulation des Rankings mit einbezogen. Dadurch soll verhindert werden, dass die entsprechend verlinkten Seiten aufgrund ihrer vermeintlichen Popularität auf den vorderen Plätzen der Trefferlisten auftauchen. - Auch die Ankertexte, also der in den meisten Web-Browsern blau unterstrichene Text, wird bei diesen Links nicht ausgewertet Die Ankertexte dienen den Suchmaschinen, den Text der indexierten Dokumente durch weitere Wörter anzureichern, die das Dokument beschreiben, aber nur in externen Dokumenten vorkommen. Letztlich bedeutet das Setzen eines "Nofollow"-Attributs also nicht, dass die Zielseite schlecht beurteilt wird. Zumindest sehen dies die Suchmaschinen-Betreiber nicht vor. Um Links mit dem "Nofollow"-Attribut anzulegen, muss folgende Syntax verwendetwerden: <a href="http://www. server.de/seite.html" rel="nofollow">Ankertext</a>. Gegenüber anderen Links unterscheiden sich diese nur durch das hier hervorgehobene Attribut. Es erscheint wenig sinnvoll, manuell solche Links anzulegen. Sobald man aber den Besuchern einer Website erlaubt, selbst Inhalte mit Links anzulegen, ist der (automatisierte) Einsatz sinnvoll. Auch diese neue Initiative der großen Suchmaschinen wird die Spam-Flut in den Trefferlisten nicht verhindern, wohl aber ein wenig mindern. Bemerkenswert ist die Tatsache, dass die drei großen Suchmaschinen diesmal an einem Strang ziehen: Dies könnte als ein erster Schritt gesehen werden, dass die Suchmaschinen sich tatsächlich als Branche begreifen und die Notwendigkeit erkannt haben, gemeinsame Regeln und Standards zu schaffen. Bleibt die Frage, wieso die vierte der größeren (US-)Suchmaschinen, Ask Jeeves, nicht mit dabei ist. Diese lässt knapp verlauten, dass man in der eigenen Suchmaschine das Problem nicht in dem Maße hätte wie Google oder Yahoo. Man werde ein anderes Verfahren einsetzen, um die Wertigkeit von Links zu berechnen."
Theme
Suchmaschinen
Object
Google
Yahoo
MSN Search

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  5. Bager, J.: Wettsuchen : (Meta-)Suchmaschinen sind die Navigatoren im Datenmeer WWW (2004) 0.12
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