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