HTML links that include parentheses, and are broadcast from GNU Social to Pump.io, are messed up. If the parenthesis sits at the end of the original link, it is then included in the linkified link on pump.io. People who follow jrobb can see this example:
https://io.jrobb.org/jrobb/note/2BE0WwaAS0KcBnuSXzPoRw
Reported by: Jon Robbins (http://jrobb.org)