What does Bookmarks mean when you have joined personals.per say,so and so has Bookmarked you.?

Answer 1

Bookmarked just means your web address was saved so that whoever bookmarked you can go back to your personals.
For example, if you were scrolling down a list of people and then you came across someone whom interested you, you would bookmark that site (or save it as favourites) so that you can go right to that site in the future rather than scroll through 100s of names to find that person again.