Amazing Capitals groups can be found on a few social networks.
Düsseldorf can be a bit of a strain for some foreigners, especially those whose German is not up to scratch. Local culture is unique and the habit of popping down the pub before the journey home from work is not as widespread as in the UK. Posts on several websites and queries to Amazing Dusseldorf emphasize the situation. Some more outgoing types stumble across others. Those that don’t may wish to try something else.
Most have a facebook account, Linked is very popular among business people in the US as is XING in Germany.