My sitemap has submitted 100 urls but only 77 are indexed (via webmaster tools). It's for a blog. I don't understand why some urls get indexed and others get ignored.
For example I could write domain.com/post-title and it gets indexed. Then the next day I write domain.com/another-post-title and it is not indexed.
The blog is a PR 0 that is under 3 months old.
So my question:
Is this normal or is this odd?
What can I do besides wait?
If it is odd is there anyone I should contact?