Facebook database design?

I have always wondered how Facebook designed the friend <-> user relation.

Add table row in jQuery

What is the best method in jQuery to add an additional row to a table as the last row?

JqGrid - Simple Searching With Additional Field(s)

i am using jqgrid and have simple searching enabled. i am wondering if there is a way to add an additional item in the select list of fields that does not exist as a column in the grid. i would call it something like 'Any Field' so i could search on any of the fields and then handle that outcome server side.

JqGrid - Simple Searching With Additional Field(s)

i am using jqgrid and have simple searching enabled. i am wondering if there is a way to add an additional item in the select list of fields that does not exist as a column in the grid. i would call it something like 'Any Field' so i could search on any of the fields and then handle that outcome server side.