To target=_blank or not to target=_blank, that is the question!

Question

Should links to external sites set target=_blank? E.g. I am on www.acme.net and have a link to www.otherplace.net, should that link be:

Answer 1

As it is a governmental website, this is a tricky question. I regularly see disclaimers for external sites on these type of sites. I don't know if this is a standard or not.

I think the answer is probably down to your own opinion, which should probably be based on usability and integrity.