Google için bir ara rel="canonical" etiketi olmalı deniyordu
<link rel="canonical" href="http://site.com/yazi-1/" />
bu sıralar bunun yanına iki etiket daha geldi bazı bloglarda gördüm
<link rev="canonical" href="http://site.com/yazi-1/" />
<link rel="shortlink" href="http://site.com/x" /> (kısaltılmış url)
ama bir çok blog kullanmıyor benim hiç bilgim yok rel="shortlink" ve rev="canonical" hakkında Türkçe bilgi bulamadım sanırım yeni bir şey
bir kaç site gezindim ingilizce bilgiler var pek çözemedim
shortlink - Google Code
Alıntı
Short URLs are useful both for space-constrained (e.g. microblogging, mobile) and manual entry (e.g. printed, spoken) applications, however URL shortening services are causing problems of their own (e.g. linkrot, analytics, security, etc.).
The rel="shortlink" proposal (which is made available with copyright, patent and trademark waivers) solves this problem cleanly, with little or no risk of collateral damage.
The proposed alternative (rev="canonical") also has numerous problems (e.g. HTML 5 deprecation of "rev", taking rather than giving canonical-ness, dangerous failure modes resulting in SEO problems, etc.). Furthermore the rel="shorturl" alternative is both confusing with many permutations (short_url, shorturl, shorturi, etc.) and affected by intellectual property issues (copyright protected specification, trademark status claimed by shorturl.com, unknown patent status).
WordPress › Short Link WordPress Plugins rel="shortlink" Microformats Wiki 
