Bug overview description.
Mixed clickability for sources w/o http or https prefix

What part(s) of the site page(s) are affected?
Posts

What is the expected behavior?
Either all sources w/o a prefix should be clickable, or none

What actual behavior is given instead?
The first source is not clickable, the second one is

Time of incident (if applicable).
n/a

Can you reproduce the bug every time?
Yes

What steps did you take to replicate this bug?
post #1283609
lustylamb.tumblr.com -> not clickable
furaffinity.net/user/lustylamb -> clickable

Clicking the "Edit" button shows this:

lustylamb.tumblr.com
www.furaffinity.net/user/lustylamb/

The first line is a valid URL, but isn't treated as such.
The second is treated as a URL, probably because it starts with www.

Errors or other messages returned (if any).
n/a