Belkin router F6D4230-4 v1 not letting Facebook app connect

Last week I started having problems with Facebook on both my Nexus 7 tablet and my Nexus phone when connected to my Wi-Fi router.
I haven't been able to find a solution on Google, and restarting my devices, router and modern hasn't helped.
Symptoms (both are intermittent, but 'more often than not':

• Facebook groups often won't load. Click the group link and it goes back to news feed. 
• Facebook notification list won't load. Clocks for a while and then says 'Couldn't fetch notifications'

however

• Facebook news feed loads and refreshes fine. 
• Facebook chat works fine. 

The kicker is that the symptoms are very similar in both the app and the mobile chrome web page from the tablet and phone. The second kicker is that on my computer, also connected via Wi-Fi and running chrome, Facebook works perfectly.

My phone not on Wi-Fi works fine. My tablet connected to my phone hot spot works fine.

Since the devices work fine not on Wi-Fi, I'm assuming they are working correctly. Since the computer works fine on Wi-Fi, and the devices worked fine on it last week, I'm assuming the Wi-Fi set up is correct. I'm at a loss.

My set up:

• modern is a Top Global MB8000 wired to the router 
• router is an aging Belkin F6D4230-4 v1000  with disabled security. Toggling the firewall off doesn't help. Putting the tablet int he router's DMZ doesn't help

My guess is that the app uses different network connections than the web site, and those connections are intermittently getting whacked (technical term) by the router. Current workaround is to use the MB8000's Wi-Fi instead of the router for the mobile devices.

Google+ First impressions

Being in Google+ is like being in an (mostly) empty coliseum. You can feel the presence of thousands, but you don't see them.

What I like:
* Circles: I like being able to group my friends
* Automatic upload of phone photos via the G+ app
* Set up: G+ is Google, and Google knows all. When I first logged into G+, it knew my previous addresses, work history, and everyone in my contact list. Set up was a breeze.
* Automatic integration with Gmail

What I don't like:
* Mandatory Circles: As far as I can tell, you can't write directly to someone in G+. Unless you make a circle for just them, then write to that circle. Could at least have given me an email link.
* Usability: G+ gave me all my contacts, and I sorted them into circles. Most of those people don't have G+. I went to share a message to a circle yesterday, and it, by default, checked a box that would email my post to those people who don't have G+. Um, no thanks.
* Usability: Automatic upload of phone photos via the G+ app had to be set up twice in order to make it work.
* Usability: The photos links don't refresh the photos. E.g., I click "photos of me" and its empty, just says "Tag yourself in some photos to show up here". So I go tag myself in some photos, go back to "photos of me" and it's still empty until i refresh the page. Same for "photos from my phone".

And finally:
* It's soooo quiet. Nothing happens there because the crowd is on Facebook.