Optimize On-Page Mobile Version

[JohnHuynh]

Hello,

Do we need optimize on-page for mobile version, such as:

• How about title tag, description tag?
• Should mobile have another sitemap or not?
• Does google penalty my webpages mobi vs desktop are duplicated content?

Thanks for any your advice!

[yeagerd]

Yes, optimize for mobile.

The only consideration for title and description is to remember that you are dealing with smaller screens that usually have larger text, as few as 10 characters may be visible on screen but around 45 is suggested for the serp title and 100 is visible for the serp description.

Yes, separate sitemap.  Also it is suggested to use 3 more if applicable.  News, Photo and Video.

NO.  Googlebot and Googlebot Mobile are two separate indexes.  They do not utilize each others data in a way to compare a page to itself cross index.  Now, with that said....  you will not optimize UX by using the same content on desktop and mobile.  They have different needs and desires.

ie.  Search

Desktop

Mylocal's Italian Restaurant MyTown Special Lasagna - Pictures, ingredients and description are very important.  Taking a moment to sell the dish and then post availability.

Mobile

Mylocal Lasagna - Availability should listed first.  Chances are they simply want to know if the special lasagna is available tonight and would prefer to find out before the light turns green.  Pictures etc. should occur in a lazy loading manor after the onload() event.

[yeagerd]

Good read on topic

http://googlewebmastercentral.blogspot.com/2009/11/help-google-index-your-mobile-site.html

[JohnHuynh]

Thanks David Yeager, 
I have check and see that my mobile site has been indexed by google. But I currently have some problems:

• I don't have a sitemap for mobile
• All contents on mobile are the same as desktop contents
• Should I use canonical tag on mobile site?

Thanks for any advice!