I've been running a small ad in facebook for a few months. Sad to say I have little idea on how the thing works. For a few weeks the conversions were doing okay then all of the sudden the conversions stopped. I would have expected to get less conversions but to get nothing at all is surprising. I haven't changed anything on the original ad. I'm now confused on what happened and why the sudden loss of conversion. When I check the reports it is still getting around the same amount of clicks and impressions as before. Can somebody help me with this please?