This was originally written by Matt Burnham, however I spiced it up a bit. I just wanted to give credit where credit is due.
1) Avoid using a flash across from reflective objects - mirrors, metal objects, and so forth.
2) Be aware of your surroundings. If it is raining or dusty where your picture is taken, it will appear to have "orbs" all over the photo. Bright light can also cause "orbs". This is why much of the paranormal investigative world does not take orbs seriously at all any more - beware of people who do take it seriously.
3) Is that your camera strap in front of the lens or a vortex? If it's black or grey, looks like it might have stitch marks, it' ...