For anyone who knows what love or depression really are, the overuse of the terms is a little offensive (at least, I kinda feel something similar to being offended, but can't quite put my finger on it).
If most people knew what being depressed felt like, they wouldn't be so quick to label themselves. I suffered (still suffer, I'm not sure?) for 3 years with clinical depression (I'm much better now, but I'm stuck with it for life). I had a friend who used to tell everyone she was manically depressed without truly understanding what it was - I used to get quite upset that she was using my illness to get attention (I know I didn't suffer manic depression, although that is another name for BiPolar, which the doctors thought I might have at one point).
Feeling depressed, and actually being depressed are two very different things.
I was told there are different forms of depression - anyone feel free to correct me if I'm wrong though. There's the physical illness, and the psychological illness. The physical is caused by a hormone problem, where too much Seratonin is absorbed into the body too quickly, so it doesn't get the opportunity to keep the Endorphine (happy hormone) at a high enough level for us to get through day to day life. The psychological depression is usually the result of a traumatic experience, or series of problems.
I was told I had the physical variety, mainly as I developed it after a very nasty bout of gastroenteritis, believe it or not.
If you've got the seratonin problem, then anti-depressants will fix it, but the psychological version means that councelling is probable the best bet.
I hope I've not rambled too much!