Okay - this is a non-medical education related topic, but something that I felt was worthwhile to post here, and see what kind of responses I get over time.
This website started out as a xoops based website. It got a decent amount of traffic from search engines, but I found the forum software was slow to load at times. Also, there seemed to be a lot features of the xoops software that I didn't need. I checked out several free forum bulletin board scripts. I didn't want to pay money for Vbulletin which is probably the best forum software out right now. I considered phpBB, but I was concerned about getting a lot of spam and security risks. phpBB is a great program, but I ran another forum with their software, and I was getting a lot of spam, probably related to all of the exploits written specifically for that software, because of it's popularity. I took a look at SMF - Simple Machines Forums and I really liked it. I had read some posts with concerns about getting decent search engine rankings in Google. I assumed that given my knowledge of SEO, that I would be able to customize it to work okay. I really liked how the software worked - the look and speed were good, and it had tons of great features. I had figured that most people probably had problems getting good rankings because of duplicate content. I was very careful to make sure that any duplicate content type pages would get excluded in the robots.txt file. I made a google sitemap and submitted it. It was very very bizarre, but for whatever reason, googlebot never spidered the forum threads! I waited well over a month, and the only time googlebot visited my site was when I removed the robots.txt exclusions and then googlebot would only visit the pages that were duplicates of the main content - not the main posts. I sent a quick email to Google, but I'm guessing I'll get no response.
After waiting over 1 month and getting none of the main threads indexed in Google (I had checked the robots.txt exclusions and the main threads were definitely not being blocked) I decided it was time to change software again. I probably would have gone with phpBB at that time, but their servers were down, and I couldn't find if they had a good conversion script from SMF to phpBB.
I recently had set-up a site using Wordpress blog software, and realized that it was the best I've used so far for SEO. I did have to set-up a few parts of it to not create duplicate content, and to block out some of the pages from robots.txt, but I think I got that all set-up very nicely. Those sites seemed to do well right off the bat for search engines.
Wordpress was modified slightly to create the forum software called bbPress. It is very simple forum software, and not overly developed at this time, but I've always been a fan of the simple websites that are clean, easy to navigate, and straightforward.
I did have a difficult time converting over the database from SMF to bbPress, but I got most of the threads converted and I got the userbase converted. I was able to fairly easily add on a sitemap and edit the themes to meet my needs. It only took about 3 days before I started to see the threads showing up in Google again, and several of them are ranking #1 (which is I think where they were when I was running the site as a xoops site). It's only been about a week since I switched the site over, so we'll see if this continues.
The main reason I'm posting this thread is because I had a difficult time finding clear information on SEO results for different forum software.
I'm still thinking that at some point I should probably just shell out the money for vbulletin as it is a much more robust software package, but I hate the thought of spending money on software when there are many good free options out there. The newest version of phpbb looks really great too - but I don't know how it'll work for search engines. I'll probably follow the development of that software and perhaps at some time, decide to make another switch. For now, I seem fairly content with bbPress. Now, I just need to start getting some medical education questions and posts going again!
