No need to go that far, especially since Photobucket only allows one acount per user, with limited bandwidth and storage, and Imageshack has been known to lose perfectly innocent images.
All that one needs to do to make the image appear, in the above is
1. Unclick the box marked "disable" BBCode in this post. I also unclicked "disable html" and "disable smilies", but doubt that was anything more than a useless reflex on my part.
2. Remove everything on the url that follows the .jpg - ie. what you see between the double quotes: "?v=0"
3. Set the image to link back to the page on Flickr where it appears. One can find the url for that page by doing a Google image search on the image url as you entered it
"farm1.static.flickr.com/121/271887757_85402c1788.jpg?v=0"
which will bring up this page on Flickr.com
which you may then link to using this format. Google image searches of images on Flickr always seem to turn up the page on which the image is found, instead of the direct link to the image, so this is a good strategy to follow in general when looking for such pages.
Remove the spaces, which I'm deliberately inserting to keep the board's software from rendering this as code
[ url = ] [ img ] farm1.static.flickr.com/121/271887757_85402c1788.jpg [ / img ] [ / url ]
This is not a technical requirement. You could insert the image without the linkback, and it would appear - for a while. But this would be a violation of Flickr's community guidelines, which include this passage
"Do link back to Flickr when you post your Flickr content elsewhere.
The Flickr service makes it possible to post content hosted on Flickr to outside web sites. However, pages on other web sites that display content hosted on flickr.com must provide a link from each photo or video back to its page on Flickr."
That's pretty reasonable on their part, I would think. If you don't link back to them, the bandwidth consumption becomes a dead loss for them, and they may very well respond by refusing to feed the image to this location, leaving you with a broken image link. So, arguably, it's both right and practical to honor those guidelines.
I hope this helped.

