Google Passes Link Juice Through iFrames aici a facut unu un test in Dec si el zice ca Google i-a indexat iframe-ul si ia dat credit la link si anchor text.

Google nu garanteaza ca indexeaza aceste iFrame-uri Frames - Webmaster Tools Help. Asa stiam si eu, dar se pare ca isi baga nasul peste tot. (IFrames are sometimes used to display content on web pages. Content displayed via iFrames may not be indexed and available to appear in Google's search results. We recommend that you avoid the use of iFrames to display content. If you do include iFrames, make sure to provide additional text-based links to the content they display, so that Googlebot can crawl and index this content.)

Pe seomoz sunt niste discutii cu privire la asta si baietii zic ca Google nu le indexeaza Are Google now indexing iFrames? | SEOmoz Q&A si Iframes & SEO | SEOmoz Q&A

Inca un articol mai detaliat despre ele si Google : Search Engines and Frames - Search Engine Watch (#SEW)


Am vazut la multe site-uri ca au prezent acel LikeBox de la Fb, care este un iFrame. Daca o sa te uiti in cache-ul de la Google, o sa vezi ca acele iFrame-uri sunt indexate.