I would be interested in this too, I have a Social Engine website also but it is so much more difficult to control than IPB I am slowly giving up on it and concentrating more on my IPB forum and improving that.
I use both IP and Social Engine and find they are very different. Social Engine is nice but so difficult to control and the support is not that good. I am slowly coming away from the Social Engine site and concentrating on IP as it is a lot better written and easier to control. Also the Support it so good.
They work very differently and you need to really think what you want your site to be. My opinion is that IP forums are far more organized than the Social Engine facebook style.
Social Engine has a Blogs and a forums plugin but both are very limited. Also the basic Social Engine package I think about $700 is not that good, you will find yourself spending $1,000's on plugins and add ons to make it more useable! I now have 53 plugins ranging from $40 - $150 each.
Hope this helps as I am now back to thinking IP is the best way forward having used both for the last 2 years.
I already have IPB 3.1.4 and it is all exactly as I want it except for a minor problem with redirects. I have asked for help but unfortunately it is still a problem so I was told to submit a ticket. This I did but support for my version is no longer available.
I am told I must upgrade, I do like the look of the new version but I notice that on my board when I go to forums there is a small paperclip to show if the topic contains attachments, this is very important to me. On the new version this is no longer there so there is no way to see if the topic contains photos without opening it.
I think that members are more likely to post if the feel they know other members better so I like the idea of the forum being more social. I have just added Headstand's News Feeds to my forum to let members know what is happening.