Everyone's story is different but I joined in 2008 and it took me about a week to understand that the company did not want employees to get involved in a way that would affect day-to-day operations. As an example, you could organise an LGBT group, print out stickers and t-shirts, dance at the local Pride, take a few photos, and you'll get a pat on the back from HR. But if you asked for health benefits for your same-sex partner, that would be at least frowned upon. As a different example, you could organise Irish-speaking evenings, and again - pat on the back. But try to push for an Irish language version of Google interface, and you can get in trouble if you make enough noise that decision makers hear about it. Both of these are actual examples I saw first hand.