Online users is just a merge of everyone that has completed a profile and, at this stage, there is no filtering on geo location, gender, age etc.
People that you have blocked will not be seen in your Online Users, Who Viewed Me, Who Liked Me, Who Hearted Me, Who Messaged Me.
Search
is currently disabled, does nothing at this time.
Hearts
Who you have Hearted and whether they have reciprocated; a reciprocated heart means Chat between you two is now open.
Messages
Active Messages are displayed here; you need to action an initial message to a reciprocated Heart in Hearts first.
Forums
is currently disabled, does nothing at this time.
My Profile
You can only set your and seeking gender once.
Everything else is at your discretion to update and a complete profie is mandatory.
Your live profile is what others logged in can see -- if you block someone they can still see your profile.
Photos are optional.
My Settings
has some useful info else disabled; you can however click on the blocked users section and unblock them if you want to, else just go to their live profile page to do it.