Thanks for the further info. I've hosted galleries on a number of platforms before. If you're not familiar with hosting your own web apps then it'd be more complicated but I'm fairly experienced with Joomla, SMF forum, and a number of other web systems, so a gallery is not particularly more complicated. That being said again it's the social element that I'd miss with a self-hosting approach. While I love Wikipedia's extensive app comparison lists for jumping off points, they sometimes make the decision harder, not easier, since there are so many options.

The 23-based options seem interesting, but what I really want is people to be able to comment on my photos on *my* site with a Facebook account, and just notify people of a new *gallery* being posted (or new single image optionally, but I tend to upload in batches and wouldn't want to see 70 individual image posts show up on my wall!). I'll look into the options with 23 and see if it can somehow do what I want. The 30 picture per month limit is somewhat frustrating though. If I'm going to pay, I might as well put in slightly more for SmugMug (20 Euro for 23 vs. $40 a year for Smug). SmugMug's presentation and gallery style is still unbeaten as far as I'm concerned (23 is actually somewhat lackluster in this area for picture enlarging in particular).
If I do end up setting up Piwigo or another locally hosted solution I'll let you all know how that goes, hehe.
- Oshyan