I have run some tools of SEO and there are a few issues that can be easily corrected, to improve phpbb SEO (if you believe it is snake oil, none of this will have impact on you).
1.
On main page there is no header level 2 for the forums (or at all). This should be corrected.We detected errors in heading structure...
Assistive technologies such as screen readers use heading tags (h1-h6) to give visitors an overview of a page without the need for them to read through the entire content. Search engines can read headings to determine the importance of page sections. They can then use this information to gauge the page's 'weight' for the search engine listings.
Would a visitor using a Screen Reader be able to quickly find the information they want from these headings?
I can manually code it into the style but it should be very easy to correct for prosilver and will adhere to web standards.
2. SID links:
All internal url's appear with SID links. While having friendly url's vs. numbers is debateable, this means that there are different url's every time a new session is generated. Why do we need SID at all?
I know that canonnical exists, but this is not for virtual infinite url's...
3. Meta description:
The description meta tag contains 437 characters which is too long.
How do I set the meta description for the main page? I have an extension that does it for each forum (taking the forum description)... but would love a setting to write it for the main page...
I think the three above points should be easy to implement in phpbb and will assist SEO...