DON'T: Tell them what they're doing wrong, or how to fix it.
DO: Offer your no-strings-attached company, and a break from pretending to be happy.
DON'T: Take their depression personally.
DO: Share your own experiences with depression.
DON'T: Feel like you need to fill every silence.
DO: Check off some items on their to-do lists.
DON'T: Pressure them to get out there and socialize.
DO: Bring over their favorite movies, or watch shows that make them laugh.
DON'T: Assume they know they have your love and support. Tell them.
DO: Make a gesture to show that you're thinking of them, if you can't physically get there.
DON'T: Question or challenge their perception of the situation; if they say they're depressed, they're depressed.
DO: Offer to help them get professional help.
DO: Make sure you have your own support system.