helenp - 9:01 am on May 13, 2013 (gmt 0)
If I participate in an on-topic forum about my niche then I include a written URL for my website in the signature (if allowed). It isn't a link so Google doesn't care for it but it allows users to know your website if they are interested.
do you mean a writen url such as http://example.com isnīt a link?
You are talking about on-topic, however if this forum allowed signatures it would be off-topic, however it could still be interesting to have it both to users and to owner, not necesarrily being spam.