I noticed that when I added my fourth sig link on - I got whacked. I went back down to three. That is my experience though. Look at the FAQ/Rules on the top navigational bar - that might help you.
I have started off with only 2 links in my sig, when I get to 50, I will sneak in a third one and only after completing a century of posts will think about adding one more. And I think I don't remember seeing any sig here on DP having more than 4 links in sig. So I will be counting on not more than 4 links to be on the safer side.
are you sure about this? I thought four links are allowed to anyone who has more than 10 posts, green reputation and is a member for 7 or more days. The lines are limited to 3. http://forums.digitalpoint.com/faq.php?faq=signatures#faq_signature_requirements
yeah that's allowed before, but now you can put just 2 signature links.. if wish you 4 signature link become premium member of digital point, fee option available there according time duration..