How Does Twitter Integrate with Photo Sharing and Social Media Networks?

Twitter is known for being a major social media network for the cable broadcast television industry, and I've had good success seeing some of my more interesting videos posted to +YouTube  go viral with the help of people tweeting about them.

According to Twitter, the appearance of tweets embedded in blogs has been improved:

Rich photo experience now in embedded Tweets
https://blog.twitter.com/2013/rich-photo-experience-now-in-embedded-tweets-3

I've tweeted photos from various networks in recent days, and I'll use Twitter's generated code to embed a few examples here.

First, lets see how a photo tweeted from Flickr embeds here in a blog:

New photo captured this week in Yosemite Valley: Storm Cloud Reflection at Valley View http://t.co/oF5kC16TIU Snowed Wed nt on Tioga Pass!
— Jeff Sullivan (@JeffSullPhoto) September 27, 2013

And a Flickr photo shared to Tumblr, then tweeted from there:

Photo: Sunrise Moon Set by Mt. Whitney on Flickr. As a general rule of thumb the full moon rises at sunset... http://t.co/FPLhNnUacb
— Jeff Sullivan (@JeffSullPhoto) September 27, 2013

Now let's try 500px:

Pic “Yosemite Falls Moonbow Star Trails” by Jeff Sullivan (@JeffSullPhoto) #500px http://t.co/yFePAcyUOg #startrails #yosemite #photography
— Star Trails Photos (@startrailsphoto) March 15, 2013

How does Facebook do?

Dust Spot Check at Sunrise this Morning I'm going to visit several locations this week, so I stepped outside... http://t.co/aGwXv0WjPu
— Jeff Sullivan (@JeffSullPhoto) September 18, 2013

What about Facebook's Instagram?

That's A Moray - today is a free day at CA Academy of Sciences at SF's Golden Gate Park. http://t.co/F0cpgfhWrW
— Jeff Sullivan (@JeffSullPhoto) September 29, 2013

And now a picture uploaded directly to Twitter:

Rim Fire in Yosemite National Park now 70% contained at 231,088 acres. pic.twitter.com/3IrLj6BtKC
— Jeff Sullivan (@JeffSullPhoto) September 3, 2013

How about video? Here's one of my videos recently popular on Vimeo:

#RimFire #timelapse http://t.co/vpiqm9CVjV by @JeffSullPhoto
— LA Times Photography (@latimesphotos) August 30, 2013

Now a video shared from YouTube:

I liked a @YouTube video from @jeffsullphoto http://t.co/gxcLVEKFsn Perseid Meteor Shower 2013
— Stephanie Weil (@stephaniexoxo14) August 15, 2013

How about URL shorteners, do they affect results? Here's a Flickr photo shared via Bit.ly:

The Winner is Stargazing by Jeffrey Sullivan. Congratulations Jeffrey! @jeffsullphoto http://t.co/RqPHn6a #astrophoto11
— Royal Observatory (@ROGAstronomers) September 8, 2011

At first I see no photos at all, and the same thing happens on my WordPress blog, but it seems that the Twitter posts just take a while to render on a blog..