I'm doing a lot of testing on Facebook with various ads and I'm starting to play with manual bidding and Bid for impressions. For my particular niche the suggested bid is such a wide range ($1 to $5). I put my max bid per thousand at about $1.50 and they barely showed my ad yesterday. For those that use CPM do you usually start your bid higher ($5) and lower it over time? Also the suggested bid amount seems to change daily (if not throughout the day). Do you adjust your max bid frequently to accommodate this?