When I tried link.all:www.domain.com, links were reported back, eg, for domain.com.uk, etc. Conceivably, this is a special case, as the domain I tried is new and showed no incoming links in Google... perhaps forcing Fast to grasp at straws.
Anyone have an idea what really to expect from this command?
>>I assume you do have a link from domain.com.uk? to domain.com<<
This isn't my site... but it's a new site I'm looking at. From what I can tell, domain.com.uk is completely unrelated to domain.com. And, in fact, none of the 125 links reported has anything to do with domain.com.
To clarify a bit, domain.com is in the form xy.com... ie, it's a two letter name, and that letter combination is pretty common. Because the site probably doesn't have any inbound links, Fast seems to be grasping at straws. Just saw one for www.xy.nl, for example.
I'm not sure from this example that I'd generalize to either "only" or "two letter."
The domain name is a text string that's not uncommon... however many letters... and the site probably doesn't yet have any external links. I'm not sure what other generalizations I'd make without further testing.
I've noticed before that engines tend to "grasp at straws," as described it, when they don't have good matches to a query. I didn't know they'd stretch things, though, on something like a link:url query.
In addition to the uk domain, on the first page I'm seeing a nl domain and an hk domain.