And more than only read a link before clicking on it, it's always better to check it BEFORE ... pointing it :

Because, if we are not careful, we can think that we are on a particular site and may be we are on another one.
One glaring example :
https//bitcointalk.org. Text here shows "BitcoinTalk" link leads to "Google".
It's a glaring example but it can be more malicious, with only one different character in URL to lead in into a phishing site for example. Paypal > PaypaI or such things.
Interesting finding. I didn't remember you could bypass the forum protection by just omitting the colon mark (":")
If you try to write [url=http://google.com]https://bitcointalk.org[/url] instead
it won't work :
http://google.com is automatically displayed
So we must be careful about this kind of url too...
