By Gracia Chiang

They are irate customers and they have found a way to air their grievances - on Facebook.

Some 2,000 people have joined a group called 'I am Singaporean and tired of service staff who can only speak Mandarin' on the popular social networking site.

At least 20 establishments - from big-name supermarkets and foodcourts to retail shops - have been singled out by members who have come forward to share frustrating experiences at these outlets.

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