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of course, these days, you can just use Google Sitemaps and get spidered a lot faster. but you still need links before you get indexed.
As suggested, Links are what you need to concentrate on. New Content, New Pages and submitting a sitemap also help.
Take the time to validate your code, check your links, submit to other directories.
Don't rush and make wholesale changes to you index page because you have not gotten listed. Give it a chance.
But now the situation changed.My old site still has same PR.
but its takes more than month before a new site start listings.
Any idea what is causing this?
Submitted to Google 3 weeks ago but still not listed
As others have said, get a link or two, or three... and you'll get listed eventually - then pray you don't have to play in the dreaded 'sandbox '. :)
then pray you don't have to play in the dreaded 'sandbox '
What's a sandbox?
I don't have a backlink. So all I need to do now is to find as many online directories as possible and submit my URL to them? Do I have to write an article when submitting my backlink?
If I have 2 new sites, and both linking to each other, does this count as backlink?
Linking to yourself is a dangerous practice. It appears that Google evaluates the value of the link. If you link, just to link, then it will hurt more than help.
Research your competitors and see what they do.