i have a test ruleset here for your reference and for further testing in your lab environment. I think Andre Sabban was working on this ruleset for a bit, so shouts to him if this is working. Please keep in mind that this requires the SSL Scanner to be enabled. Also in the ruleset there are references to AD groups etc. The Twitter Username should go into the List "Allowed Twitter Sites"
Thanks for your responses. First of all say that I have URL Filtering too but you can access https://twitter.com/LAGACETADELPORN even ponhography are block.
I am making test with your Rule Stephan, but I can´t make what I want.
I would like, permit acces to twitter, but block some sites. If I change the rule Allow Twitter Sub Sites for Block Twitter and change de list with /LAGACETADELPORN* doesn´t match.