first of all: thanks a lot for this plugin, it perfectly does what I need for my blog.
Still, I've got a tiny problem concerning the preview picture. It's not quite clear to me what the difference between the "featured picture" and the "custom field" is and how I can use the custom field. Ususally, I want one of the pictures included in the post to be shown in the automatically genereated facebook entry.
This works mighty fine as long as I post only one picture at a time via the web interface or the official WordPress app for iOS. If I try to use another app on the iPhone (BlogPress), the automatic post gets still sent to Facebook and Twitter, but in this case the Word Social logo shows up instead of a preview picture.
Would the "custom field" be of any help to me, if I understood how it works? ;)
Thanks in advance!