Nothing there vector.
here's your URL:
https :// pbs.twimg. com/media/FIXe6XvVkAAdfb9?format=jpg&name=medium
(I added the spaces)
The filename MUST have "jpg", "png","gif", or "bmp" as the end of the filename.
Note that there is no filename at all. It's a database lookup. Copying by URL and pasting in here won't get you jack.
You need something like: "myimage.png"