I am little confused about the url. If i have my site with the url: http://something.com then after few weeks i change it to: http://www.something.com Will it have any effect on the back links or the indexing of pages in search engines?
If you did link popularity and linked everything t http://site.com - YES! You should make redirect and set www.site.com as you main domain URL in Google webmaster tools
usually no effect on search engine indexing. but backlinks might affect. Always go for 301 htaccess redirect
http://something.com http://www.something.com These things are different. My suggestion is link only to http://www.something.com, instead of http://something.com.