I thought I would share a plugin I found that adds convenience for new users giving them the ability to login/register with facebook, linkedin, google etc... credentials. It took me a bit of messing around to get it working but its pretty cool.
Social Login for wordpress by LoginRadius
You can see how it integrates with SimplePress on my site: http://www.boardaddict.ca/forum/
I have it integrated with both my join/register for the overall site and within the forum itself which to be honest was automatic. Anywhere you have a login screen it should show up.
Hope somebody finds this helpful.