Sharing my away matches online? What kind of idea is this? This looks and sound like a haven for the police.
We live in such times that almost everything is monitored. When we go to away matches there is always an 'away list'. You already provide the most basic info about yourselves. The cameras at the stadium record you. You can be tracked by a simple photo from a phone. If someone really is interested in finding you - they will. They don't need to make a website to keep track of you. If you are paranoid about it being used anyway, set your UltrasDiary profile to private and nobody will be able to track your away game records. This portal is run by an away game fanatic belonging to the NS ultras group from Legia Warszawa. It is in no way an informant site!