Well, hmmm... Not sure I totally agree with this last statement. First, there are a ton of users out there that don't particularly care to be on multiple website forums and social media. If you run the type of forum that has lots of product announcements or artists or musician gigs, you want to get the word out.
Posting to Twitter and Facebook is great to reach to the people that might not be engaging with your website. Hopefully you get some conversions but even if you dont, at least you have followers engaging with your "brand" for lack of a better word, on some level socially.
Anyway, I digress.
I have been using this plugin, Social Sharing w/Dynamic Opengraph Tags, up until about 6 months ago. It was working great with a few minor caveats but now It is now causing a few issues with my site and had to be disabled.
This is a GREAT plugin that will allow you to tweet your post and there are settings to fine tune whether you want to tweet individual posts or the whole thread.
What is really great about this extension is it will pull an image from your post and tweet that along with a snippet of that post.
It definitely needs more work, updating and some enhancements would be nice. I am willing to help collab and code with someone as well as providing the testing but I haven't coded an extenstion before, sorry to say, even though I've been coding in PHP for a while now.
I'd prefer to team up with someone on this and once I get a handle on how it works I can always take over the coding if need be.
Here is the info...
P.S. I tried to email Jeff a few months back but never heard from him, so I assume he's moved on...
Social Sharing w/Dynamic Opengraph Tags
Clean Name: lotusjeff/socialshare
Description: Social Sharing w/Dynamic Opengraph and Twitter Cards. Provides social sharing icons w/ supporting data.