what links are allowed in signature?

Solution
If it's OK in a post, it should be OK in a sig.

In general, stuff that's not OK is spam and obscenities/profanity.

If it's a site you're related to, or if you get any kind of reward (ad money, donate buttons, affiliate links, free extra storage etc.), don't link to it.

If it falls afoul of our GRAPES (Guns, Religion, Abortion, Politics, Economics, Sexuality) policy, probably don't link to it.

Note that it's not just links; please don't say 'I work for XYZ Web Hosting; buy from us!'.
If it's OK in a post, it should be OK in a sig.

In general, stuff that's not OK is spam and obscenities/profanity.

If it's a site you're related to, or if you get any kind of reward (ad money, donate buttons, affiliate links, free extra storage etc.), don't link to it.

If it falls afoul of our GRAPES (Guns, Religion, Abortion, Politics, Economics, Sexuality) policy, probably don't link to it.

Note that it's not just links; please don't say 'I work for XYZ Web Hosting; buy from us!'.
 
Solution