i have been fauceting for the last one year.but i have found some big scam websites.koinbounty is one of them.boombit is another.i want everyone to mention scam faucets so that others may avoid them.
In my opinion faucets are waste of time anyway, so it's pretty hard to get scammed by one. If it doesn't pay you the dust that you are clicking for, you should just stop using it.
Nevertheless, you should research and doubt any single website that has something to do with Bitcoin at this time. Read reviews and be careful. There are awfully lot of scammers out there. Bitcoin related businesses are still in a wild and reputation systems still have a lot of loopholes that give scammers advantage.
So read, review, be careful and doubt everything!