accessing
createdAt
	^ createdAt ifNil: [| joinDateString |
		joinDateString := ((self documentTree xpath: '//div[@class="profile-joindate"]/span/@title') stringValue).
		"joinDateString := joinDateString copyReplaceAll: '3 May' with: '03 May'.
		joinDateString := joinDateString copyReplaceAll: '5 May' with: '05 May'.
		joinDateString := joinDateString copyReplaceAll: '2 Feb' with: '02 Feb'.
		joinDateString := joinDateString copyReplaceAll: '6 Mar' with: '06 Mar'."
		createdAt := (ZTimestampFormat fromString:'4:05 PM - 3 Feb 2001') parse: joinDateString.
	]