How often should you change your profile picture?

[Q]

I find changing your profile picture or taking a selfie too often is irritating. I usually change mine every few weeks or so (if it's a good picture). They're high quality pictures.

What do you think of people who change their profile pictures often?
What is a good time frame for when a person should change their profile picture?
What do you think of photoshoots or pictures purposefully taken for a profile picture?
What do you think of people changing their profile picture to an older one (like, one or two profile pictures ago). Do you consider that annoying?

I'm taking this poll for a psychology project about how Facebook and other social media affect self-esteem, etc.


Thanks!