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